Sorry to hear about your mental health problems, as a fellow sufferer I understand how hard life is for you.
Firstly, if you want your husband to get a posting on compassionate grounds you may need to make case for it, so I would contact your HIVE office or unit welfare office for help. A letter from your GP explaining your condition and how a move may be detrimental to your health would bolster your case.
You said you are ex-forces, have you thought of contacting Combat Stress? You can self refer. They are fantastic and can see you during a stay at one of their centers or at home. If you like the outdoors and animals, I can recommend the therapeutic value of Horseback UK, a weeks stay there did me the world of good. I can't recommend it enough.
As for the social networking, I would close your account for the time being till you are stronger. Unfortunately military wives on camp can be notorious for gossip and !!!!!iness, and I know that telling you to ignore them doesnt make you feel better. But really just think, if all they have to do is moan and !!!!! about you then they really are pathetic arent they.
You say you are waiting to see a psychiattrist, I believe that under the armed forces covenant your GP should mark your referral as priority. You could perhaps ask the GP to refer you to your Community Mental Health team? Unfortunatley mental health services are overstretched and waiting times are long.
Are there any clubs off camp that you could go to with your child? Maybe a local mother and toddlers group or an exercise class? it would get you off camp, which at times i recall is massively claustraphobic, and making friends away from the military. I know its tough, but you will get there. I will PM you my email and if you need to chat message me

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