My Problems Are : 1. Loud And Hard Heart Beat

My problems are : 1. Loud and hard heart beat 2. Irregularity in period(this is for the second time) ,but extreme pain at the lower part of belly. 3. Increasing weight without excessive food intake. 4.Sometimes I feel hectic, can't sit gently then. 5.Can't hear to any freaking story or event or just can't take any mental pressure. So, what are the possible causes behind all this?