1. it seems that you have already entered stage of diabetic retinopathy, thus it is upto your Doctor to decide about the medicine regarding your blood glucose level because persistent elevated blood sugar will eventually deteriorate your vision.
2. for maintaining blood sugar level:
. avoid sugar,all sweets,cakes,sweetened biscuits/drinks, jam,honey,mango,grapes , and canned fruits.
.eat all leafy vegetables,tomato,cucumber,brinjal,cauliflower,lady's finger,butter milk,sugar free drinks,all cereals,sprouted pulses.
.eat in restricted quantities:cereals,chapati,roti,bread,cornflour,plain or salted biscuits,rice,meat,eggs,chicken,fish,skimmed milk.
3. Regarding your prostate problem, first check with your Doctor about PSA test for any malignancy, in the mean time:
avoid: newly harvested rice,black gram, salt,refined powder,white sesame, jaggery,curd,cakes,pastry,cheese,potato,tomato,vinegar,lime,spicy food
. Tab Himplasia (Himalaya) 1 tablet thrice a day with Chandan assav 30ml (with equal amount of water.

Hi..according to your age,flow of semen and erection must be less than an young person.your problem is due to BHP.u can try homeopathy.in my experience,homeopathy can control your problem,avoiding a surgical treatment.in high sugar level surgery may be fatal.BHP can be managed successfully with surgical help.but if sugar level is highh,chance of infection must be high.So there are two way to solve your problem.One to control your sugar level and second is to control your hypertrophy prostate.thanks.take care.