Oops😣 please help😭

My stomach pain woke me up this morning and it hurts so much I can’t sleep. I’ve had a cold for the past couple of days and I kept getting sinus headaches so I’d Advil or ibuprofen whenever I got one which was once or twice a day. I’m in severe pain right now (I’m 16) and I have to go to work today and can’t cancel. Should I take Tums to feel better or do I have to go to the doctors? Has this happened to any of you ladies and if it has what did you do and what should I do?