Weight Regain On 1200 Calories?

Hey everyone, I have been very successful with my weight loss, went from a bmi of 43 to 21.5. Was doing about 1000 calories, but my blood pressure keeps getting lower, and my doctor is starting to think it might get to a level of concern so I upped my calories to 1200, I am around where I want to maintain, wouldn't mind an extra 5 lbs but am okay where I am at. For some reason now that I have upped that 200 calories I have seen myself gain a pound or two in the past couple weeks of 1200 calories. I will note my exercise has gotten screwed for a couple weeks due to being very busy, and due to a medical issue I will be our of exercise commission for at least a month.

I am torn what should I do. It freaks me right out to see the scale start going the other way. On the same token I don't want my blood pressure to get too low that I need medical intervention. Any advice would be greatly appreciate.