Is TSH Level Of 6.4 A Cause For Concern?

Question : Is TSH level considered too high if it is 6.4? My T3 and T4 levels are barely out of range as well. I was diagnosed with hypothyroidism in 2012 and have taken armour thyroid for 3 years. I see where some people's thyroid and pituitary gland activity have numbers that are much higher or lower. I gained a lot of weight from 2011-2012. Have had trouble keeping weight off for years. Thyroid was in check then. I just worked out really hard, crash dieted, and drank energy drinks. Just recently I found out that an anti-depressant I've taken since 1999 is a big weight gainer. Elavil. I take 100-150 mg of Elavil, 2 mg of Clonazepam, and 1 Xanax each day along with Armour Thyroid dosage of 15 mg. I wonder if the Elavil or another med is the real culprit and my slightly out of whack thyroid is not really that much of a factor. I don't have my T3 and T4 numbers available, but I remember they were just barely out of normal range. I have had my TSH, T3, and T4 monitored since 2012 and just seems that compared to most people they are not that out of normal range. One other thing to consider is I could get away with crazy dieting and working out really hard in my late 20's and 30's, but have more difficulty now since I'm almost 44. Age 39 is when I really started having trouble keeping the weight off. Before that I just yo yo'ed a lot with my weight. btw, I hard a heart attack at the end of 2012 because of developing coronary artery disease and high blood pressure. I'm 6 ft 3 in tall. Normal weight has been between 200-220. I have fluctuated between 270-295 the past 3 years.