Thats how I experienced my first anxiety attack and it caused me to have some weird scary thoughts, that I couldn't get rid of I convinced myself I was going crazy or that I was crazy. I felt as if I was high all the time for almost a year, until I experienced another obsessive thought that replaced my previous fears, so yeah it's all in your head, mine went away once I started obsessing about something else.
Many people, including many on this forum, have their first anxiety attacks while stoned. For most, it goes away, but some of us become quickly conditioned to expect anxiety to reoccur and it becomes a chronic problem. What you're feeling isn't the drug anymore, as has already been said, is your expectation of continuing anxiety. If this doesn't pass soon, I'd think about seeing a therapist to make sure it doesn't become your new way of thinking. And it pretty much says, this drug probably isn't for you anymore.
Any effects are long gone, so maybe you are over-analyzing yourself in fear. Try to realize nothing is wrong and see if it goes away.