Hi there ~ I understand your concerns. Having panic attacks after the restarting of drugs after a prolonged period of being off of drugs will probably make you so. I hope you stop smoking pot again and this is more so the case as you need to pass the drug test. I hope you understand as it is a question of your functioning on a daily basis. I also believe that your hypothyroidism may contribute to your panic attacks depending on the amount of levothyroxine supplementation you are on. Your thyroid also needs to be checked and made sure that you will start to feel better with the consultation with an internist as well as a psychiatrist. I hope this helps. Take care and have a lovely day!