universal credit closed my case

hi everyone looking for some advice in January i took unwell with a fungus infection in my chest, was hospitalised for 2 months fighting for my life, then at the same time finding out i had cancer so then had to start chemotherapy, my weight dropping from 10.5 stone down to 6, i suffered muscle loss and was confined to a wheelchair for about 3 months, my health has improved, but i still do suffer from muscle loss and weakness, before all this i was almost 2 years into setting my own business up, since March i have being trying to get help from the dwp, twice now they have closed my claim, the most recent yesterday, with again no explanation as to why, all tasks were up to date, i had an appointment with my work coach yesterday at 3.50, but the appointment was cancelled at 11.53 because my claim had being closed, i have had no money since January, selling my car in order to live, had problem with my teeth and thought i would get help for that, the dentist has now come back saying i now have a bill to pay as i am not on universal credit, i can't leave a message on my journal because the claim is closed, i am at a lost end the whole process of this, and the time it has taken so far to get to here, and again for it to be closed, i now have to start the process all over again, and no idea how long this process again will take, i am so stressed out with it all, it has now started affecting my health again, i am off food, have lost weight again, and losing the will to live, how hard is it to get any help, just need some help until i am back on my feet and can get back to work, am sitting here thinking maybe i should just go out onto the streets begging, my partner themselves has just set up in business also and not able to take a wage from it as yet, and jobseekers allowance i would not get due to myself setting up in business and not earning enough to pay NI in the last 2 years any advice would be greatly appreciated