Hi there ~
I do not think that the drain cleaner caused your anxiety to shoot up. Also doing squats and weights actually help with your condition. So I would think neither of the above caused your condition or worsened it. I understand your concern and feel like you might need to see a psychiatrist
for a complete workup as your symptoms are indicative of a psychiatric illness called generalized anxiety disorder
with panic attacks/anxiety attacks. There are many medications that are helpful with the same. I hope this helps. Also therapy may be another option that you might want to consider for psychological help.
Take care and have a lovely day!