Wheelchair for a disabled student

Hello!  I am a 21 year old lgbt student with multiple disabilities which severely limit my access to class, work, and activities.  In order to manage my symptoms and control flare-ups, my doctor recommended that I use a wheelchair. 
Currently I am using a secondhand pediatric chair (it was the closest to my hip measurements that myself and my occupational therapist were able to find without the help of insurance) which due to the incorrect sizing and design, causes pain to my back and shoulders, not to mention worsening the carpal tunnel in my wrists!  I was using a rusted secondhand powerchair from craigslist but I had to sell it due to the ill fit and moving to a different state.

My insurance will not cover the custom fitted wheelchair I require, as they deem it not an emergency - but using an ill-fitting manual chair can cause serious and permanent damage over time.  For these reasons I am fundraising for a custom sized wheelchair in order to lessen the strain on my shoulders, wrists, and back.  With my income it will take years to save for this chair - by which time I may have caused permanent damage to my wrists and shoulders - so I am reaching out to you for help!  I have exhausted most other options, please help me reach my goal of gaining more independence and ability - I can't do it alone and I need your help!!

Help me achieve my goals!!! <3