Hey Amy 

So I wanted to reply but probably won't be much help, I am so, so sorry to hear about your mum. I can't even begin to imagine how tough that was at such a young age, and you're clearly a very tough young lady, and I have no doubt your mum will be so proud of you. 

I completely understand where you're coming from in terms of thinking the absolute worst, it definately would be coming to terms with the loss of your mother. I lost my mother very recently, which is no where near the time as you, and I don't have the depth of understanding of loss that you have, but since then, I have also had constant thoughts of being unwell. I've had a couple of sessions of therapy since my passed, and we have discussed this. I would imagine that delving deeper into this with your therapist will eventually help ease your mind of this thoughts. 

I wish you so much luck on your journey, and I hope your therapist gives you the support you really deserve.

Lots of love xx