I read your other thread and your appt is on the 19th?Of this month?
Honestly(I'm not a dr)but if you are having loss of bowel/bladder this issue needs to be seen to.You may consider going to the ER or urgent care and see if although you do not have a diagnosis for them to work from there is any help that they can offer you to at least make your quality of life better til your appt.
I have no experience with psoriasis other than reading and am not familiar with all it can do,complications,etc but if you are seriously weak,in pain,losing wads of hair and are having issues with controlling your bladder then I would receommend seeking treatment.I would do this myself if I were in your position.Like I said you are likely to not get a diagnosis but you can let them know you have a rheumy appt on the 19th but are so miserable you are just looking for help until you can get in there.
Then call the rheumy office Mon and let them know you had to seek urgent/ER care over the weekend,are worsening and is there any way at all they can get you in sooner as you are really really struggling/call the referring dr too and see if they can call and throw their weight in with your plea or maybe see you for followup to the ER/urgent care.
But if it were me and I were describing those symptoms I can tell you if I called my rheumy on his cell he would either A:meet me at his office or at the ER.Loss of bladder needs to be checked and can often indicate serious issue as does being so weak that you cannot walk.You may have electrolyte issues and that WILL make you feel bad horribly bad.
I am NOT trying to frighten you.I am just saying if I were in your position I would be trying to find some care/relief to help get me thru the weekend and if unable to get into the dr early until the appt.If your rheumy has hospital privileges where you go they can be contacted or they might have one on call or working today.If they have hosp privileges then they can be called in they may not want to come in as you havent been seen yet but may request testing and tell his staff to work you in.
Hope you feel better and get some relief.