Hello Ristina, it sounds like what is known as "discontinuation syndrome". Unfortunately with some medications, there is a nasty hangover effect when you come off them. Sometimes this can even happen if you taper carefully off. I was just saying this in another thread on this forum... when I tapered off a medication like this a while ago, my GP knew about this effect and tapered me down on the "bad" medication and onto a very low dose of another one that was less prone to the discontinuation syndrome. This ended up working well for me, but it would be worth you talking to your GP again about these symptoms to see what he or she can do.
I am curious, though, as to why you decided to come off medication completely rather than trying to move onto something different? It sounds like you have been living with the agoraphobia and panic attacks for many years, so this is a long term illness rather than something temporary. There are so many options out there, it could be that your GP is not as well versed in what is available and you might need to consider getting a referral to a psychiatrist.
You also don't mention whether you have been seeing a therapist at all? Panic attacks and agoraphobia are often treated very well through different types of therapy, like Cognitive Behavioural Therapy. Living with this for 20 years I'm sure you've probably heard of all this alreadty but I thought it was worth checking in and asking.
