irritable bowel syndrome?

(Sheffield, UK)

Hi, i'm a normal 19 year old english guy, weight in proportion to height..

my 24 year old sister suffers from IBS and over the past year i've feared I may have started with it.

I'm not on any medication, and don't have a bad medical history apart from eye problems and eczema as a child but that's it.

I do suffer from anxiety, even i know that. However, my bowel movements are strange, one day my stools can be normal and solid, the next they can be like rabbit droppings, and i've eaten nothing out of the ordinary, just my same regular diet, although i do tend to eat a different times each day, not a set time. I get nervous a lot even about little things that i shouldn't get nervous about, which makes my stomach tense up and makes me think i need to go to the toilet. It's so annoying and want to be diagnosed with IBS or at least know what the problem is.

My sister drinks peppermint tea which supposedly helps her stomach, i've started drinking this today.

Please help me!