why send me for assesment

hi can someone tell me whats going on here please will try to cut short jan this year got work capability questionaire sent off 3 feb 5 wks went by phoned asked why hadnt heard nothing maximus said they wrote to gp man on phone said it was prob to see if i had to have a face to face asessment couple of weeks went by phoned back was told gp had only just replied they hadnt made decision yet sorry forgot to say i have been on esa for around 10 yrs when it was ib i also get dla was told no decision yet then to my horror got letter to go for a face to face medical assesment the whole thing was awful my freind took me by car took over an hour and a half to get there i have severe authiritis and neurophidy amongst other things it truly was dreadfull got through it that was 6 july i had it waited a few weeks heard nothing phoned told me no decision yet phoned again a couple of occasions no decission so went to my gp asked what was put in my esa113 form he basicly said my mobility was poor and other things wich i thought was in my favour one question asks could the patient travel to an examination by public transport or taxi he has clearly ticked no and they made me go why. does someone know whats going on i only found this out the other day when i got a copy of the esa113 from my gp otherwise i would not have gone to it it is nearly 6 months now i am worried sick they are going to take my esa away from me the not knowing and dreading that post coming each day is torture why did they make me go for the assesment and why am i waiting so long can someone put my mind at rest please thankyou all the best jackie