Oh Lil! You poor chook!!! Thereare some meds you can get to increase supply - fernergan is one of them (not sure I spelt it correctly though). I hope you can get something sorted sweetie. Maybe have a chat with your GP? My MCHN was USELESS when I was having BFing issues - never told me about the meds that would help!
About the solids thing - my MCHN has told us (Mother's Group) that although WHO suggests 6 months, it is up to us to decide when our babes are ready. There are two already on solids. As Griff's Mummy - you know best. If you think it will help, and you don't have a history of allergies in your family, you could try on baby rice or something.

HTH.

Hugs.

MG