Hi @jddnld
I'm sorry to hear about your situation, it's understandably wearing and anxiety-provoking to have continual money worries hanging over you. Clearly, no matter how hard you try, because of the ways in which your health issues affect you from day to day (even if you have bad days and slightly better days) you feel overwhelmed and defeated. That sort of circumstance would drive many of us to despair, it's pernicious.
You must put in another claim for PIP, but to be successful it's really important to understand how to write your responses to the questions on the forms. The assessors, as a PP has said, are less interested in what your diagnoses are and more interested in exactly how your conditions impact you from day to day. For example, I have fibromyalgia (amongst other chronic diseases) and while I always tell the assessor that I live with a debilitating baseline of pain, I have to substantiate that by detailing how the condition affects my capacity to carry out daily living tasks. Take preparing food - I often can't bend to use the oven, I have a gadget that unscrews jar lids for me (wrist pain), and I frequently abandon food preparation halfway through because of fatigue and/or pain, which means some days I don't eat promptly when hungry, or I don't eat adequately because my fallback is often cereal. When I have acute episodes of fibromyalgia symptoms I can go for days without regular meals, and not only that but some of the medication I'm on messes around with my appetite, which makes me less motivated to cook regularly. The upshot is I can't reliably prepare meals for myself, neither can I do certain tasks involved in meal prep repeatedly (as someone without my difficulties could) in a way that ensures I complete meal preparation, and neither can I do so safely, eg. without making pain in my legs and hips worse by bending.
Those three words - reliably, repeatedly and safely - are the criteria upon which how your disability affects you is measured by PIP assessors. So when answering each question on the form that applies to you, frame your answers with those three key words in mind. It might feel a bit odd to focus on describing things in that way, but that's what they want to know. As you can imagine from the bit I wrote about preparing meals, there are frequently days when I need help to do it adequately, whether that be with the help of aids like the jar opener or electric tin opener, or a person supporting me physically (oven door) and emotionally (eg. prompting me to push through the lack of motivation). Whether or not I have the aids I need, or a friend, partner, neighbour or family member to encourage/assist me is technically irrelevant - it's the fact that I need them that's important. Of course, I always mention what bits of support I do get, but some people don't get any, which can make living with their conditions even harder. As a mum, it's also vital to make clear that your parental responsibilities and tasks are made more difficult by your health conditions, and juggling being a parent with doing daily living tasks for your own needs and care makes life much harder than if you were just looking after yourself. Mention any help at all that you get with childcare, and any that you don't get but actually need because of the way your illness affects you.
I go through the form writing detailed answers along those lines to all the questions that affect me. That, along with any letters from hospital that show my various diagnoses, is my evidence. I've never had any kind of special medical report written by a health professional to help me claim PIP, although no doubt it's helpful if you can get such a report.
The PP who recommended the Benefits and Work website was spot on, their guides have helped me so much over the years. The annual membership costs less than £20 (doesn't automatically renew each year if you no longer need it) and as a member you're able to download their detailed guides that really help you to structure your answers to the forms.
I have never been turned down for PIP.