What Can I Take For Gastric Discomfort And Fast Heartbeat If I Have Thyroid Issues, PCOS, And Can’t Use Pan DSR Long-term?

Hi doctor m suffering from gastric problem. And I have thyroid and recently I came across about pco problem so my gync suggested to take metformin 250. I was consuming pan dsr tablet felt good. But it s not good for long term . So wt can I take for gastric problem doctor. Help me out. I feel so discomfort n my heart beats fast due to this.