I've raised £800 to help fund a power assist for my wheelchair

I am in desperate need of a new wheelchair and powerassist to help me regain my independence.
My name is Osian. I'm a 20 year old uni student, studying Maths, and I have 17 medical conditions (and counting). My current wheelchair is falling apart and is now unsafe for me to use. Because of it malfunctioning, I have fallen into main roads twice.
I am fundraising for a powerassist to attach to a wheelchair that suits my needs. This wheelchair will be made to my measurements and will take into account my medical conditions, meaning that I will be in considerably less pain, safer, and much happier. The cost of this wheelchair is £3k.
However, in order to use this wheelchair, I need a powerassist called a SmartDrive. This is essentially a motor that attaches to the back of the wheelchair, and will allow me to leave my flat. Due to debilitating fatigue, I am currently only able to leave my flat about once a week, and I'm unable to get to lectures. The SmartDrive costs about £5k.
The NHS is only able to provide me with a wheelchair that is completely unsuitable. It worsens my pain and fatigue. I have applied to all the grants I possibly can and I have put all my savings into the new wheelchair. I am stuck.
Having fled abuse in the summer, and now being a student with no family who is too sick to work a job alongside my degree, I am desperate. I have no other option than to hope that people here may be able to help me out a little. Anything that you are able to donate is appreciated more deeply than I can put into words.