Most likely what happened is that you had a really bad experience, you accentuated it by smoking weed, which just overactivated your neurotransmitters all over again, and now are having conditioned thoughts based on that experience. That's how anxiety becomes chronic, and a lot of people get their first anxiety attacks while high. I'd avoid the drugs now and see a therapist who can help you decondition yourself from the bad experience and help you learn how not to think this is going to keep happening. And something about LSD -- there hasn't been any pure LSD on the market since the early 60's, it's generally cut with speed, which is why the trips last so long. That makes it hard to come down. You're also supposed to have a calming guide with you if you're new to the drug who can talk you down. It's very powerful, and can bring things out of you that might have come out eventually anyway -- that was the original purpose of the drug. Marijuana can do this too. So for you, I'm afraid it's time to stay away from drugs and recover yourself. Peace.
There are some new and extremely dangerous street drugs showing up, including a new LSD hybrid that can keep you on a ghastly high for days. Nobody is sure yet what the after effects of these are. I don't mean to frighten you, but if you dropped acid a month ago and are still having bizarre head trips, I would urge you to see your doctor.
It is also very possible that this drug triggered a massive panic attack and your memories are still so vivid, so frightening, they trigger ANOTHER panic attack...........kind of like your brain just can't stop the whirlwind. You say you have moments of calm when you feel "almost" normal, but then something happens and you're back in panic mode.
Please consult your doctor.
I wish you peace.