Well, to me it sounds like you are having some troubles with releasing, and perhaps you are even doing something wrongly and in a way which is not recommended to do while trying to get out of body experience or astral projecting.
Your problem should not really disturb you for too much time, mostly this trouble is fixable and can be easily solved after practicing for a while and using various methods and solutions. It is entirely possible to overcome these issues and find possible and logical solutions to it, so you do not have to worry about it too much. Eventually you will overcome this issue and find the best solution that can solve it as quickly as possible.
Though, from time to time this trouble can be sort of consuming and it may take some time and practice before you will be able to perform full projection and out of body experience, and it will take some time until you will be able to fully project and experience this again. Everything needs some patience, time and practice, but I am sure that you will be okay with it.
There are some things you can do about this trouble, by using logical and possible methods and solutions. . I have several recommendations and solutions I would like to present in this thread, and I really hope this helps. These may be the solutions that would help you to overcome this issue in a quick and smooth way, without causing any problematic things.
Firstly, I assume that you are not meditating before attempting and this probably leads to your mind wandering, possible stressful thoughts intruding, and of course that you're not getting relaxed and thus you don't achieve the needed state of relaxation of the body, your mind and thoughts. Each of these will probably lead to the tensing of your body which relaxation is essential since you have to literally seperate your mind and physical body.
Now, I am not talking about what you did while you were trying to do while projecting. You were basically trying to project by performing meditation. This is not the meditation I am talking about. What I am talking about, is that you probably aren't meditating before the projection itself.
It is very good and possible to project while performing meditation, but what you probably aren't doing is performing a general meditation before the projecting, which should be especially dedicated for relaxation, getting rid of mind wandering, stressful thoughts, etc.
So what I recommend is to meditate regulary even before you're trying to jump to projecting, and also I recommend you to try getting back into the 'swing' of the things with a bit of dream control for concentration as you relax.
Secondly, I can also get the conclusion that your chakras might be either clogged or aren't all balanced as needed in order to perform several forms of magick and projections.
Basically when your chakras are not in a good condition your astral body isn't in a good condition either, which explains the buzzing and possible pain.
So I recommend you to start balancing and cleansing your chakras and again, meditating regulary for it. You may find tutorials about simple chakra balancing and cleansing methods by using Google or by using any other search engines you would like to use. There, you can find various methods to easily balance your chakras and cleanse them.
I also recommend you to look for methods of improving your concentration, which is basically done by a lot of practice and patience. You will find many methods and exercises of improving your concentration level by practicing and doing this regulary.
Thirdly, I also easily assume that you aren't projecting in a way that is safe and probably not the best for you. Each person is different and special and in the same, projection techniques are entirely different and special for various people. If you are really having trouble following through with the technique you are currently using it usually means that it requires certain feeling or energies to work correctly and safely with the particular method.
So what I recommend for this is to research for different forms and methods of mental projection and don't be scared to try them out. Once you find one that is easy, possible and safe for you, "make up by our own" or if one is already available to use- a corresponding projection technique.
So use these tips, and don't be lazy to dedicate enough time, practice and patience in order to achieve your goals.