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Dear Dr. Roach: Several years ago, I attended a presentation about insomnia. A registered nurse discussed how, in her career at a nursing home, she had many residents with insomnia. She said she had amazing success with these residents.

Dear Dr. Roach: If I take Viagra on an empty stomach, eat dinner one hour later, then have sex 45 minutes after that, will Viagra work very effectively in this situation? Anon.

Dear Dr. Roach: My significant other and I are debating whether I should pursue followup testing with a rheumatologist for the possibility of ankylosing spondylitis.

Dear Dr. Roach: I am thinking of having a total knee replacement done, as recommended by my doctor. I have bone on bone in my knee. What is your opinion? I know a friend of a friend who had one done three months ago and has had nothing but trouble.

Dear Dr. Roach: In 2000 (at age 53), I had a mastectomy with a TRAM flap reconstruction. In 2010, I began experiencing lower back pain. I did physical therapy and have continued those exercises since then, but the back pain worsened last year.

Dear Dr. Roach: I am an 84-year-old woman, and have always been a good walker. Three months ago, I fell down and could not get up from the floor. I was not in pain, but I could not move my right leg.

Is marijuana as good as its reputation for treating painful conditions? Many years ago, I suffered a neck injury in Japan that resulted in chronic pain.

Dear Dr. Roach: Would you please comment on common or uncommon issues that might be expected in a pregnancy at age 57? I am overall very healthy, with no issues other than slightly elevated LDL. I have not gone through menopause.

Dear Dr. Roach: I was seeing my primary care physician every six months for about five years. We had mutual respect, and I enjoyed seeing him. Then, I got diagnosed with breast cancer and had to see other doctors for a long time.

Dear Dr. Roach: My boyfriend recently was diagnosed with an aneurysm. The report says the abdominal aorta is 3.02 centimetres in largest dimension and recommends screening every six months.