Hi Silly,
Being home alone was a huge trigger for me too.
I really think it takes planning and thinking ahead. Now that you know that being alone is going to throw you, you can make a plan to deal with it. For me, I would go out or if I was home, I would rent a movie I'd been wanting to see or call someone I had talked to for awhile.
Planning to see a therapist is a good idea, and remember that SR is always open and there's lots of support here.