It's worth noting though that if since this supposed event you feel as if you can't access magic it's most likely all in your own head. As doe suggested cleanse your chakras and spend a while meditating, you'll find them again.
As for curses personally I'd do nothing at all. They really did you no great wrong other than messing with your head a little and I personally would leave it up to the universe to balance out, each to their own though.
Like they said you need to reopen your chakras, but unlike they said there are spells to supress or block your magic for a period of time. These spells are repurposed binding spells aimed for specific chakra points like the mouth and stomach. The mouth is the activation of a spell the stomach is the center of your bodies chakra system. It harnesses energy from food or nature and redistributes it. Now these spells can not last forever they are not originally made for the living. They can't control your chakra for a long period of time. At most a few months. Best thing to do is meditate and forcable make your chakras clear out. I'd suggest spells to but not verbal spells more towards alchemical or hand movement or placement spells. Or you can wait. It's up to you. Just be very careful when clearing out these blocks go one at a time. Or you'll hurt yourself. Lots of water and sleep. A lot of people recently have been playing with these spells without knowing the consequences. By blocking someone's chakras you have to block a portion if your own if you keep the other person blocked for a long period of time the more of your own chakra is sealed away. For every month they keep you suppressed that's another about 5% of their magic they lose for 4x the time you've suppressed. So your blocked one month he blocks himself/herself for 4 months. It gradually takes a greater toll on them. Unlock yourself and make a charm for protection. You should have ample time. They'll be out atleast a god 1/3 of their ability for at least 4x how long you've been blocked. If you have a friend have them release your making with an I binding spell reworked for living organisms.
You don't need a curse. The cost of the spell will harm them as much as any curse. They can even get severely sick or injured because they're body is weakene to. Don't use a curse it will harm tem traumatically and then karma/the gods of justice/equivalent exchange/etc will whip your ass. I'm serious unless they caused a death or something serious you will hurt yourself more.