Hi, my name is james92! lcwra payments help for uc

hi everyone, i have been claiming uc since January last year due to my work contract ending my assessment period is the 19th to the 20th, on November the 18th i was diagnosed with depression anxiety and anger management problems and prescribed medication aswell as agreeing to attend therapy sessions where feasible. i spoke to my work coach via the journal the next day who said i should use the change of circumstances for a health condition which i had done and at her discretion changed my commitments accordingly, on the 30th i was asked to submit a fit note so i contacted my gp but due to covid they was mostly pre booked so they booked me a phone appointment for the 17th dec , i received my sick note on the 23rd and uploaded to uc which is dated 17-dec 20 to 4-jan 21, this was not accepted until the 28th due to Christmas, on the 1st January i received  a notification in my journal that i would have to complete a uc50, i received this a few days later and sent it off, i stopped bothering to ask for sick notes as my work coach had referred me to the whp jets program and declared me fit for work before assesment, received a letter in march stating i had to attend a wca on the 1st of april, 2 days ago i had a message in my journal which had deleted all commitments and uploaded a message with the assesment letter where was found to have limited capability for work and work related activity, the letter itself is only dated the 14th april the day they sent the letter and the only info is that i will be paid 3 months after i first gave evidence and if anything is owed it will be backdated? sorry for the long winded message and thankyou in advance