travel for work...

Beatrice
Heya, I am currently so stressed. I'm going to start a new job next week and I'm going to be travelling straight away, and I think for a few weeks. 
I've always wanted to travel for work but now I'm scared I'm going to be homesick and miss my bf and cat and I'm getting really stressed and sad and anxious, I'm imagining all sorts of horrible scenarios and losing my appetite (I think I even skipped my period cos of the stress) 
(I have been diagnosed with anxiety which causes a lot of these reactions)
Does any of you travel for work? Do you have any advice on this and how to calm myself down? 🤕