Ramadhaan & Fasting

Q: Ramadaan is here and I have a bit of a concern about my fasts. I can't keep fasts, the pain in my stomach is excruciating. I can't keep them out of Ramadaan as the same thing happens. Infact on a normal day if I skip a meal or don't eat when I'm hungry then I get that pain. I've been to two doctors and they are of the opinion that I have ulcers as well as IBS (irritable bowel syndrome). During the past Ramadaan I had to stop fasting as I was not responding to the ulcer medication and the pain was unbearable, I'm also told there is no cure for IBS. Am I allowed to not fast and pay for them instead?

Q: If you are going to have a blood test in Ramadhaan. Can you keep roza on that day?

Q: There was a little blood in my discharge but stopped immediately. It is not my menstrual cycle yet. It's only due to start in 2 weeks? Am I able to carry on with my fast?

Q: I have an ulcer and what happens is that if I do not eat than I get sever pains which is really bad times. The doctor advised me to eat quite often and not let my tummy go empty. I find it hard to disobey the command of Allah Ta'ala and I love fasting so much! Can I just carry on fasting?

Q: I would like to know whether inhaling of medication breaks one's fast? (E.g. Vicks or  a drop of white oil etc in boiling water.)

Q: Once while fasting in ramadhaan I coudn't control myself and I was touching my private parts and then I ejaculated. Do I need to do qadha fasting and kaffara as well?

Q: Does blood coming out from the throat break the fast? What if it goes down in the directly in stomach?

Q: Can Sadaqatul Fitr be calculated by the price of flour, as in the place I stay, wheat and barley is not found (or very difficult to find), and dates are extemely expensive.

Q: Can someone put mehndi or hair color while she is fasting?

Q: 

1. Does masturbation nullify the fast?

2. If it does nullify the fast, does this person have to stay without eating and drinking for the rest of the day?

3. When he takes ghusl, will he just rinse his mouth and nose or will he gargle his mouth properly and put water properly in his nose?