I struggle with this too, and I"m very bad about isolating when I hit my low

For me it's my dog, when I get low and in a rut, I take her out and we go hiking and walking around the park or around our property at the house.

I live in a rural area, and when classes aren't in session I'm stuck in town and I stay at home or work, it helps that I have a very close friend that when I start isolating she drags me out of the house or checks on me.

Another trick I use is I go to the coffeeshop, it's a good half hour drive, but when I start getting so lonely I feel I may just start crying and breaking down I get up and go sit in there and read, it helps just being around other people and in a busy enviroment for me, since I live in such a rural and partially isolated area.