My receptors are just not fine...

Have me or trash me
My 5HT-3 are already on fire
Please me or despise me
My D2 are about to expire
Excite me or dump me
My alpha-1 are about to retire
My B-1 is crying in pain
My H-1 won't shut up,won't retain
My M are tired,and working in vain
My N are lousy,drowsy and it's become my fame
My B-2 are almost,no longer there
And my pain is what remains
Sit away from me,or hump over me
Its OK,for you no longer care
Oh GOD how can i possible refrain
My lacrimal sac from squeezing in pain
My cornea from getting drenched in rain
Of memories,laughter,emotions...oh are my attempts all in vain?