You should not feel guilty about feeling that way. I think we all get frustrated because there doesn't seem to be an effective way for our loved ones to know how we feel.
Physical injuries can be seen, touched, etc. Metal illness has nothing concrete for them to see, hear, or feel. They know we are suffering but their understanding of how much, etc. Well I just don't think there is an effective way.
We are all here for you and that is a good thing. Especially since we are going through or have gone through the same or similar symptoms ourselves.