Hi Stretchygal
The exact same thing happened to me. Certain people who I considered to be close mates have been unresponsive since I told them I was ill. I too reconnected with an old friend, but she disappeared when I told her I was ill. Other people, while not blanking me completely, send me 'small talk emails' occasionally passing the time of day and the weather etc and then ending it with a breezy 'hope you're well' when they know full well I am not! The same people always seem to be busy when I suggest we meet up and catch up properly. Hmmm. I'm not really sure why they bother! I ended up getting very annoyed with one of my silent 'friends' (who I was previously very close to) and emailed him to tell him off for blanking me when I told him I was ill, saying who did he think he was, what a bad friend, etc. I didn't get a reply (surprisingly!) but I felt a bit better at the time for venting my feelings. I'm not advocating this approach though as you might say something in anger that you don't mean, and emails once sent cannot be retrieved!
I have felt very angry over the course of my illness at just how many friends have ditched me, or only keep in touch on a perfunctory level. I have concluded that they must feel extremely uncomfortable with illness generally (as many people do, it reminds them that we are all human and vulnerable), so uncomfortable in fact that they are willing to drop a friend just so they don't have to deal with their issues. Their loss! It is a cowardly way for them to react and it hurts but as my OH says, 'just think less of them'.
As for your mum, I really feel for you because I have the same problem with my dad. He really believes that illness=weakness and we have had several arguments about my being ill. I know what you mean about feeling inhibited about talking to her because I feel the same with my parents, it's often like my illness is a taboo subject. Again it's their way of protecting against dealing with issues relating to illness and vulnerability - our parents are just people after all, like our friends. I have tried to talk to my dad and get him to understand but to no avail so we just don't talk about it any more. It's very sad and I wish we had a better relationship. All you can do is use your own judgement in these situations, realise that you are *not* weak, you are ill, and try to seek others who know the score and are sympathetic - like the people on this forum!!
Take care
CSx