I have been in my current role for roughly 15 months- the first 12 months or so went fairly well, but since then several issues have crept up which have caused me to start looking for other employment. The issues include: a reluctance by my supervisor to make reasonable adjustments required to assist me with my disability, breakdown of relationship with one or two colleagues due to harassment (and my supervisor's unwillingness to deal with the issues- choosing to ignore them instead), and my position becoming 'redundant' following the delivery of a product to the client- subsequently leaving me with very little work to do.
Having spoken to my supervisor about the these issues, it has become clear that he is not trying to resolve them, but rather trying to use them to leverage me out of the company (I guess to save money, as there's not much work on at the moment).
What I'm worried about is if (or more likely, when) I leave the company for another job, I doubt whether the reference my supervisor will give will be all that great, despite the fact that I have delivered several projects during my time in employment here, and that the work I have completed has been to a good standard- the pressure that I am under to leave the company makes me worry that any reference he provides me with for future employment will have a negative overtone.
Obviously, I don't know for sure that the reference will be negative, but how should I approach this when dealing with future prospective employers? How do I get 'my side' of the story over without jeopardising my chances of getting other roles?