Does diarrhoea make your period worse?
No, and it's common to have diarrhoea or be a bit constipated when having your period or right before it. It's the hormones.
Worse than what? Your period shouldn't be bad to begin with, if it is then talk to your doctor about the menstrual problems that you suffer from and do something about them. Ibuprofen is a painkiller so can be used to deal with menstrual related headaches and menstrual cramps. Ibuprofen is also an NSAID so will help to reduce menstrual flow too, it's often used to treat heavy periods.
What happens if you have a full period for a week then a week later you get another period for three days?
If a person or child has chronic diarrhoea or vomiting for any period of time it is best to give the victim water to reduce the effects of dehydration. this is usually given mixed with glucose and minerals that are also lost with this malady. A short burst of this will not necessarily do much harm, however diarrhoea can kill if left untreated.
It depends on how sick you hamster is. The first thing to do would be to get him to a vet ASAP. However there are things you can do at home. Make sure he is clean, warm and left alone. Stress can make everything worse. Check on him occasionally to see how he is doing. Make sure he has clean water, close to his bed so he doesn't have to move. If he is ill…