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Dear Dr. Roach: I always thought that I had a cast iron stomach; however, after a bout of suspected food poisoning about six months ago, I鈥檝e had two incidences of violent vomiting for about a half hour.

Dear Dr. Roach : Some 20 years ago, as I was turning 50, a biopsy confirmed prostate cancer. I elected to deal with that through surgery, a radical perineal prostatectomy.

Dear Dr. Roach: I鈥檇 like information about a rare condition called Mayer-Rokitansky-Kuster-Hauser syndrome. The person I am asking about with this condition was born in 1958 without a uterus or vagina, and has one kidney.

Dear Dr. Roach: I read that with certain medications, you should never take the generic medicine over the nongeneric. I read this for Synthroid and levothyroxine, as the range varies greatly. Is this true? I have also heard this about heart drugs. K.

Dear Dr. Roach: I am interested in your opinion of the drug Fosamax. I am a 63-year-old female who recently had my first bone density scan. The results were severe osteopenia.

Dear Dr. Roach: My stepdad is 84 years old and having problems with B12 deficiency. He is taking B12 shots, 1,000 mcg once a week, in addition to taking a 5,000 mcg B12 vitamin daily. The numbers come back below 200.

Dear Dr. Roach: My uncle, a retired surgeon, is 90 years old. I visit my uncle periodically to inquire about his health and well-being. He eats, but is a little weak.

Dear Dr. Roach: I am a 68-year-old male and have been very athletic my entire life. I never took any meds. I developed arthritis in both knees and had one set of cortisone injections.

Dear Dr. Roach: I am 70 years old and had a kidney transplant 18 years ago. I developed diabetes, but it was controlled through oral medication.

Dear Dr. Roach: For two weeks, I have had double vision when I look down to the lower side. Each eye is individually normal, but I have double vision when using both eyes. An MRI was done by my doctor and was normal.