Hi there ~
I understand your concerns. It is very concerning that you are having some sort of tissue discharge in your urine after urination. I believe that you are having some problems with urination and that you will benefit from consulting a urologist
. I believe you might also be prepared for an invasive investigation after a urinalysis
, just to make sure that you are doing well with no concerns for any organic problems in your urinary tract
. I hope you do so as soon as you can. Also please relate to the doctor that you had a back injury
so as to get an examination of the area and maybe also imaging studies if it is serious to rule out any issue with your back. Medications for the pain will be helpful. I hope this helps.
Take care and have a lovely day!