ESA - New Claim

Hi, I am a new member and wanted a bit of advice about my new claim. I am filling out the ESA50 form and my problem is lack of evidence, my doctors are always busy and when I went to see them a few days ago to ask for a couple of referrals they wanted to get my health issues dealt with first and so I have to go back, hence I don't have that evidence to put down on my claim form, as well as any written letters which I am sure they will be too busy to provide, is this normal with GPs and if so what is the best way round it.

I am partially deaf since birth, have curvature of the spine resulting in severe back pain, have suffered anxiety and depression for over 6 years, have severe endometriosis which causes me daily pain, but my fitnote is for labyrinthitis which has been the icing on the cake and caused me to transfer from JSA to ESA. I am asking for referrals to ENT & a re-referral to Gynae (as my prev surgery was in 2014, with the inference that I would need further surgery which I ignored a bit as it was drastic) but my other illnesses are ones for which I only have proof of meds. I feel like they are just going to look at my form and dismiss it due to lack of extra info at this point, can I send in info to them in the next few weeks should I be able to get it (trying to get doctors appts is like trying to get blood out of a stone). Sorry if this post is a bit all over the show, its all a bit new to me and overwhelming!!

I will do, thanks so much for your help Gordon .. looks like I have lots of reading to catch up on.