How do I deal with this emotion?

Almost two months ago, a friend of mine killed himself. I’ve been sad, I’ve been angry, and I’ve felt lost. I had expected all that, and my family and friends have helped a lot. I think I am slowly but surely getting over it – or rather, I thought I was. During the last weeks, however, I have noticed something new: I feel scared. I don’t know what exactly I’m scared of…it took me quite a bit to even realize that was what I’ve been feeling. I’m okay a lot of the time, but the mix of nervousness, insecurity and anxiety is stressful. Especially as it sneaks up on me without warning. Is there any way I can deal with that? Is it even possible this change doesn’t have anything to do with my friend’s suicide?

P.S.: I already am in therapy, but it will be a while until I can see my therapist again.