Yes it can make you "thicker". This is called bloating and is only water weight. It will go down once you are through with your period.
Blood clots
Not likely.
Yes, it could do. Any illness can make your period late or not come at all
It will not make your hair thicker or thinner. it will only do that if you over process your hair.
Shaving does not "make your hair grow back thicker".
Some people experience bleeding or spotting during pregnancy that can make them think they're having a period.
Well the answer is simple really if your having terrible cramps then the best way to get rid of it is take a hot bottle of water and put it beside you so u cant get cold. Most woman masturbate there uterus to help them relax there periods and not get paranoid. Most of the times when you have your period you might feel a bit crazy. One minute your smiling at someone the next minute your feeling pissed off. To reduce having less period you should avoid sugary things and to much salty things aswell as it will make your period blood thicker and more .
add more hair to your bangs :)
Yes it can last longer
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.
add a bit of flour or another thicker paint and mix it
You will have blood in your knickers/panties and when you wipe. It can be painful and make you feel ill