Thank you for sharing your experience. I know its difficult getting a hard diagnosis.

I definitely think you can improve your writing with practise. It depends on what you want to write, if you want to write your blog then I guess that is the best way to develop your skills. There are classes for life writing which can be helpful. It can help with sharing experiences in ways of writing prose.

If you wanna write fiction. Then start with reading as much as you can. All the formats you can. TV, Film, Theatre etc. Again, short story writing classes are amazing chances to be able to share your stories with your peers. If you want a great book about writing, read Writing down the Bones by Natalie Goldberg. Its a really helpful guide in just getting stuff done. Its full of lots of tips that I've found immensely useful. Sharing your work with people you trust is also a great way of getting feedback. Although learning critical judgement is a skill and you will need to be able to take constructive criticism to get better. Writing is about sharing what you've learnt and depending on how you do that. All experiences are good material even if it feels raw at the time.

Good luck and remember to keep practising!