Sammy as you know my weight loss hasn't slown down at all, I'm looking on track for two pounds this week but because of the Jury service I've not really had a proper PP day since Monday. That will probably continue next week as well. I may well be picked for a case which could continue for several weeks, picking 12 out of last 15 on Monday (don't the wheels of law grind slowly!). So for me the next few weeks could really slow down my weightloss but I'm good with that, I'll be impressed with myself if I can stick to PV days in that time.
I know you're struggling but give it a few days and you should feel well and energised. I'm not really surprised about how easy it was for you to get into ketosis, its the same for me. I would imagine the issues you had on Cambridge were linked to the fact that you were doing the shakes instead of food, its probably much more extreme.
Very impressed with your ability to eat out, I daren't!