Also, what about attachments like friendships and such? Can they also be a form of suffering? The reason Im asking is because I am someone who experiences HUGE rushes of nostalgia, almost to the point of wishing I can turn back time, but in the end, I only find myself getting upset.
Seems to me you just answered your own question.
I can't just cut off human contact as a lay person and tell my friends I dont want to see them anymore >_<
I think there is another option.
To see friends with wisdom, compassion, etc. instead of desiring and wanting, etc. Mostly because the seeing friend part is not what causes the problem. Cutting off contact would not work anyway as the desires would still be there. If you cut off all contact, you would still desire to see them and you would suffer because you can't. So that would not work IMO. It's the desire/wanting part that causes the problems. For example, Thich Nhat Hanh has many, many friends, but he does not suffer because of that. The Buddha had many friends but did not suffer because of that. So it can't be that having friends is what causes the problem. When you approach friends with genuine metta, etc. instead of wanting, then no problem. How it seems to me anyway.