Hi, i had TBI 14 years ago and like you had the same after effects. From your post it appears to me you are not fully recovered yet and you have to give your brain more rest [as you said your head swells up after walking awhile,well thats not right].As regards to physio, i had excercises after 3 months ,alas they were the wrong ones as i discovered 10 years later after getting my hospital records.I now have C.P. around my head and back area for the rest of my life and believe me i would not wish that on anybody.Make sure that your excercises are gentle to begin with and slowly progress from there and make sure your have a good physio and report any adverse reactions. Dont believe in the "no pain,no gain" slogan. good luck.