Please help me

Lauren
To start off I was irregular when I was younger but after I had a baby an was put on birth control my cycles became normal but now 2 1/2 yrs later I had two small cycles in 1 month both lasting 2-3 days each that was in Nov in Dec didnt have a cycle then this month had it 2-3days lite then spotting also bad back pain on left side an sick when I drink anything with milk an eat anything but can drink Trumoo chocolate milk. DOCTOR won't c me til the end of March when I called him an told him Please someone help me make sense of this.