It sounds like you have a plan in place that will work for your appointments.

I'm not sure why you think that you aren't as important as his other clients, or why you would be wasting his time. The bottom line, do your sessions with him help you? That's what's important. Discuss your concerns about not having a support system outside of him and your friend. Maybe he can suggest a group (I know not for everyone), that you might be able to take part in that will give you some extra support.

If there is a Mental Health Association near you, (there is an awesome one in my area), reach out and see what they have to offer. They are non-profit and generally run on donations/funding. The one in our area has lots of resources, and provides volunteer opportunities too. Try to build up your support network. I know, it's hard, and honestly I need to take some of my own advice.