Hey poppypoppops
There is a mental health support section on this forum, you are certainly not alone in this. I imagine there are not many people you can talk to at home who would understand your diagnosis and what it means to you. So please use this forum to find buddies and ask questions. We are all in this together!
I suppose by finding this forum and telling us what is up you are on the way to "accepting" your diagnosis. We all have to live with it, some accept it better than others. Personally I am very relieved to be on medication that has stopped the symptoms. Although my case is not very severe, I found it very difficult to be ill all day, every day, for months (years) on end. That is physically and mentally exhausting.
I hope you will find a medicine that suits you. I am a bit concerned that the GI has let you go with no treatment, ask the IBD nurse to follow you up so that you do have some regular support. If they don't know about the joint aches then you should tell them.
Once you do get treatment and start to feel better I am sure you will notice the difference and that will spur you on.
Good luck