Hello, great questions.

I get tingling and severe head pressure and headaches even if I go for a short walk, seems if I'm on the computer too long, talking too much....it all starts up and takes 2 days sometimes for symptoms to subside.

Bathroom situation? I put ground flaxseed on my oatmeal every morning and never have a problem, apart from being so good for you, flaxseed does have a laxative effect so if you try it just try one Tablespoon first to see how you do, sometimes I use 2 Tablespoons, I used to have a terrible problem going to the bathroom, tried everything under the sun and the flaxseed does it.
Also, drink lot's of water. I eat raisins too.

I drink whey protein drinks with the BCAAs. EAS is a good brand and tastes yummy too.

Rest: My therapist says if my headaches are so severe they last all day or longer, I've done too much but...just talking will do it so it's so tough.
I've always been so active but right now walking up hill makes my head explode.

If you can take those 4 weeks off work I'd do it, good luck, hang in there.