Dancinggirl,
I am myself amazed at how often I need to empty my bladder sometimes. When shopping, I spend most time on looking for toilets, I joke - I remember few older friends of mine were like this earlier when I was younger.. I understand, that besides skin wrinkles, things get less elastic inside too. And they change position. Womb, intestines, etc. Some parts are pressing on another, get swollen, etc.
I understand that you are on your feet a lot. Try to take time and lie down for few minutes when you can - perhaps horizontal position will help things inside to get into position? When walking try to remember to pull your inside up, hold it there, and exercise this way. Pelvic floor exercises were good advice, I think - flexing muscles inside helps. This burning sounds strange so it's good idea to check - sound like a mild infection?
If you had your legs swolen you'd know - my look like elephant's sometimes - after drinking alcohol, sitting down a lot, not drinking enough water, general lack of exercise..
What is your diet like? Some foods and spices are diuretic - perhaps there is something there what could be adjusted? Tea and coffee makes me go every 10 min. Drink pure water! I had to adjust really a lot - can't eat any prepared by others and restaurant food with god knows in it because great chances are that I'll have problem afterwards - my allergies are so intense now. They say that this is how it gets with age for some.
I have a great problem falling asleep too - I like taking tablets. Unfortunately GPs don't want to prescribe them. This is another thing which gets me mad, because I can't get it why they are so determined to make our life even more difficult - most menopausal women have this problem, they know very well - wasn't sleeping problem what pills were invented for? (Please don't respond with an 'addiction' stuff to me!). Did you try to persuade your GP? .. even for a short while?
Good luck!