Pip, not enough information on form

Hi all,
I have been on high rate car and mobility the last 2 years, my dla was up for renewal so they sent me the PIP forms. I filled them in just after I had my spinal surgery and a sacroiliac joint fusion and as you can probably guess I wasn't in a good place due to my pain. In a panic I filled the forms in when I was alone as I had forgotten about them as all focus was on my op. when I remembered about my forms it wAs close to the deadline date and didn't want my money to be stopped so I filled them in and sent them off. I had no face to face assessment and my award has come back and I'm devastated as I have only been awarded low mobility and nothing else. Going through my award I have totally miss understood the mental health question and ticked no to mental health as I didn't realise my panic attacks, stress ,anxietydepression,confusion And my extreme fatigue came under mental health so it's partly my fault that my award is wrong.
I am still in horrific pain on loads of meds, I am upset as I have made such a mistake. I'm really worried as without my care and my enhanced mobility I'm going to be housebound. I use crutches but the majority of the time in use a wheelchair as I can't walk no distance because of my pain. I'm pushed in a wheelchair as my condition is such that I am unable to physically push myself because of my chronic pain. As it is now I stand to loose a carer, my blue bage and everything. I have put in for a mandatory reconsideration following the guides on here so I just hope my original decision will be overturned. I feel if I had have had a face to face assesment then this wouldn't have been a problem as my mum or husband would have been with me and would have picked up on the mental health question. I put about my condition on the form I just ticked no to mental health. I think that the HP would have realised the severity of my disability and my poor mobility.
Up until 3 years ago I had a high profile job in retail, filling in paperwork was always my strength, it totally devastates me how much my life has changed in such a short space of time. I think a lot of my confusion and lack of concentration is a side effect of my meds. I'm waiting now on this reconsideration. My esa has been overturned and I have been placed in the support group on the strength of a letter from gp and consultant stating I'm dependant on someone pushing me in my wheelchair as I physically can't push myself. It's a waiting game for my pip now.