Railroad Man

Well it has been one wk. now since my surgery on my right knee. After 30 years of weare and tear of getting up & down off of moving equipment on the railroad, it has finally come to the point of worn out knee's. My surgery went very well in the hospital,except with a few problems with hospital staff. I took therpy for 3 days in the hospital and have 3 days set up for this week to complete with in home health care and then 3 days for next wk.Then 6 wk pre-set at an outpatient pt center.I try to get up every hour to two hrs and walk thru my house,stretching,stoping by the kitchen counter and doing a few exercises as instructed by pt nurse. One of my main questions is,my doctor prescribed me the percocet 7.5-325 for the pain,now I'm a 59 year old male weighing about 280 lbs. and you have to stay on a regular schedule of taking them @ every 4 hr. Am I wrong by asking the Dr. to please prescribe me the 10-325 which are a little stronger for the pain control along with the same acetaminopen which would last a little longer. I have requested this twice to the dr and never get a yes or no. The dr's pa said just take two at one time, is this the right answere for the question,then you would double your amount of tylenol to 650mg. I know someone out there has a good answere for this question. I am no Junkie by all means,and wish I didn't have to take anything, but that's not possible. Next question- do you have short night's of sleep and alot of lying in the bed awake. I get short naps during the day in the sofa lounge, which are better sleeping positions than laying flat on your back in the bed. I guess I'm just expecting this to get better than it has, too quick. I seem to have more pain sleeping in the bed rather than the lounge chair, but I guess I'm just rushing the whole thing,please give me some of y'alls remarks.