Hi, can you help!!

I started taking methatrexate on monday....3 tabs and then folic acid 3 days later!
Since then i have felt sick and very tired. I also have a perminent minty taste in my mouth and very sore eyes! Are all these side effects from taking methatrexate!
I have 3 small children and no partner to help so i need to able to manage on my own, but feeling like i do, i don't think i can!!