Should I appeal masters rejection: law

I'm basically at the end of my degree and things are really looking dire. I tried my best but my mental health really got the better of me and that minimum 2:1 grade I'll need for a law degree, is looking less and less easy to achieve.
In my university, there's an option for us to do an integrated masters the mlaw. I saw this as a good option as I really do not know what I want to do currently and this will help with my overall grade and be more likely to get me a 2:1. 1 applied for it and my university said we had to have achieved 50% in second year. I achieved 49% but have extenuating circumstances (I was diagnosed with ADHD and was not given support until recently in which my grades have improved to 2:1 grades) my university said they will consider all applications but they declined almost instantly saying my grade was too low and as was my attendance. I am having some mental and health issues which contributed to that attendance. I spoke to my university counseller about it and she said I should appeal on the grounds of disability discrimination or something like that. I'm not really that's a thing but I was thinking about appealing because when I got that rejection I felt lost again. What would you guys do? Give it up or try and appeal.
Has anyone ever appealed a masters and w feel like I have proper reasons.

Did your referee explain the reason for your grade trajectory in your application?

Yes, I put everything.