My friend is a Accredited Lean Practitioner and is also disabled due to a spinal injury.
She is able to cope with most everyday tasks but does require help for 'heavy' tasks or doing things at height such as changing a light bulb.
Over the past 18 months she has applied for 4 jobs that she is fully qualified to do, and had done this work for a number of years for the DWP, yet she has not even been granted an interview. All 4 jobs have been with the same company and she has discovered that 3 of those positions were filled by people less qualified than her. After the last rejection she has asked for written evidence for the reason why she did not get an interview and also a copy of their disability policy. It is now a month later and despite a number of follow up emails requesting this information she has had no response. She is now going to seek advice from the Disability Rights Board to what action she can take to force them to comply. It is a very large company listed on the FTSE, not a small family type of business.
I would suggest the OP contacts previous employers and asks them for written clarification why he was dismissed from his position. If they say because of staff re-organisation/redundancies etc he should ask for a copy of their selection criteria and a copy of his assessment results.
To the OP, you are NOT being paranoid. Our experience is that Disability Discrimination is rife throughout all sectors of industry, both private and public.