well i can sort of relate. i cant get hard as good or have much sexual drive for a few days after e. its especially worse when you take a ton of it. but theres an explanation...serotonin controls your appetite, sex drive, mood etc. so with your serotonin levels at an all time low your having those problems. they will subside, just give it time and take some 5htp.
also as far as the panic attack goes, i dont think iv had a full blown panic attack, but i have been damn close when i was drunk, on adderall, smoked, and then took niquill to fall asleep. my heart was racing, my thoughts were racing, and i thought i was going to die. some water, time, and breathe concentration made mine go away. but i still get anxiety when i smoke or do certain drugs.
it could go away with time, or it could get worse if you keep abusing. just take a break and im sure youll be ok to roll and smoke once in a great while.
good luck