mark- you can only be on the hcg for a maximum of 40 days. protein shakes are also not part of the protocol. clinics do all kinds of different things but there is no research to back up any of their changes. the link to the original protocol is at the top L of the page- "pounds and inches".
if you've been on it for 2 months, you've probably hit immunity. i'd advise you to stop the hcg and do phase 3 (no sugar, no starch) for 3 weeks.
some clinics don't have their patients stop if they're using homeopathic hcg, but there is also no research to back up that idea.