I really want to get better but i don’t know if i should see a psychiatrist or a psychologist.

I’ve (M,21) been feeling bad since 2 years ago but recently my dog got sick and i feel like that triggered my anxiety.
I cant sleep (i wont stop thinking), i have intrusive thoughts and now for some reason i fear im going crazy (is this normal?)

I really want to get better but i don’t know where should i seek for help.

Also what can i expect about anxiety and getting help. 
Thank you to whoever sees this and i hope you have a great day!