Nausea feeling on my stomach. Concerns!

Hi, I am Ramya, 32 years old. Having nausea feeling often .I don't have ulcer but feeling nausea sometimes and aversion on foods. After my second delivery 1.3 years before, not feeling good about my stomach. Initially it was good somewhat. My c section scar infected and had some antibiotics nearly 10 days. What would be the cause for nausea feeling. After my 1st delivery, i am too good. But after my second c section delivery, i dont feel good 100%. Whenever I go to toilet, full wash out feeling tired/exhausted. sometimes have feeling that always want to go toilet. Last time when I had mutton, I felt this nausea feeling 2-3 days and this time  also same. Yesterday had mutton. Morning full washout. After that aversion on foods and somewhat tired. I have 6 years old son and 1.3 years daughter. Kindly suggest and your opinion on my concerns Regards, Ramya