Doing Work Out Consistently. Having Lower Back, Heel Hurts And Having Less Energy. Having Asthma And Prescribed Testim Cream. Worried?

Question: Hi and good day! I am a 54 year old man. I workout very hard and consistently, both lifting weights and doing cardio. I am 5 ft 11 and 1/2 inches tall and weigh 193. However, lately I am beginning to experience more things that seem to do with getting old. My lower back causes me problems, my muscles are not as big as they used to be, my left heel hurts, I have less energy than I used to, I take frequent naps, and my asthma seems to be getting worse. As a result, I went to see my urologist to get my testosterone checked. He said it was low in that my total was 269, and my free test level was also low. He is more than willing to prescribe the testosterone cream Testim. However, I am a bit "chicken" to take this. My asthma symptoms mostly take place at night, and I am afraid Testim will exacerbate this. I am also afraid of Cancer and losing my hair. I am greatly tempted, mainly because I want to look like i used to (buffer). However, I was told that once you start this stuff, you can't stop because your testicles will stop producing testosterone on their own. Please give me your honest opinion about whether or not you feel this is risky. I don't have ED, because I got a penile implant 1 year ago.

Really helpful answer. Thx so much!