Am I going crazy ?

So for a about the past two months I’ve been feeling very moody ... I go from sad to angry and angry to sad all over again . Sometimes I’m just laying down watching t.v in a regular mood and all of a sudden my heart starts speeding up and I get kinda paranoid for no reason at all . Also , I just get this urge to cry mid- day at least once a day . Things are just triggering me faster than they normally would . For example , if something small is not going how I wanted to do it I’ll just have an emotional breakdown . And lately a lot of people have been telling me I’m not acting like myself or how I used to be . I’m just tired of feeling this way . Has this happen to any of you guys and do you know why it happens? I’m just really confused with myself .