Burps And nausea. What do i do further?

Hello Doctor I have been experiencing digestive symptoms for about 1 month. - I developed constipation about a month ago. I usually pass stool daily, sometimes 2–3 times a day, but I often feel I need to wait several minutes before passing stool like 10 min. - The day before yesterday, when I was feeling significant constipation, I had to put pressure while passing stool and noticed a small amount of  blood. Since then, there has been no further bleeding. - I have frequent burping and a feeling of heaviness in the epigastric region throughout the day. - I experience random brief teasing/twinge-like pains on the right side of my abdomen that come and go. - I feel nausea too sometimes. - I also experience low energy, fatigue, and a heavy-headed feeling, which tends to become more noticeable when I have significant gas or abdominal discomfort. What do I do further?