hi charliemama, i don't really have anything helpful to say other than i was the person at all the mums and babies groups with a 3month old who would cry the whole session while the other babies lay happily giggling and smiling. some days i really resented my ds. he had to be carried all day (and most of the night), was incredibly fussy and demanding.
and you know what? he grew out of it. i tried to go with it even though there were parts of me wanting to force him to play on his own/sleep on his own etc, but i just kept carrying him in a sling all day, at least i was working off some of the baby fat! gradually gradually he became more confident. he stopped crying all day. he slept in his cot instead of in my arms. started to play on his own a bit. and you know now jpeople comment on how happy and confident he is (at 10 months), it's just one big irony.
babies' development dictates that they won't always be like this. their digestion seems to take a while to adjust to this new way of getting nutrients. no disrespect to DG, but i prob wouldn't start solids esp if he seems really windy and in discomfort, it may just make it worse.
anyway, sorry i've just rambled and made no point at all. i guess what i'm saying is do the bestyou can to get through this, don't beat yourself up about it, i think most parents have days when they'd rather not have had their dc's, however wonderful they might be (it's just darn hard work), and know that even if you do nothing, things will change and get easier.
xx