What Causes Mild Nausea Along With Loss Of Appetite?

Hello, i have a concern thats been bothering me for close to 2 weeks now. Throughout the process of my day im experiencing mild nasea that is constant. 1 being least 10 being horrible, the nasea is a constant 3 all day. Im having a significant loss of appetite, i mean i ll be hungry, but when i try to eat, the swallowing reflex or basic intuitive function of it is off. i basically have to think and force myself to chew and swallow. These past 2 weeks i have lost regularity of my bowel movements....i tried laxative and it had me runnin to the bathroom for 24 hrs, which was cool...because i ate alot and didnt BM for 2 days before i did it. Now that the laxatives wore off, its back to this bloated, nasea during the day and chronic heartburn at nights. Its hard to eat and im not pooping. i dnt think its constipation because when i do have an urge to pass, my stool is loose in consistency and very little. I smoke a pack of cigs a day for 9 years....i also drink a beer a day after wrk daily, and i have some whiskey once a week, usually a nice 8oz cup straight. My blood pressure, blood sugar, all major vitals are normal as i get checked atleast 2 times a year. Im very concerned, any questions or answers, suggestions, would be greatly appreciated. im 26 years old btw Im running no fever, no headaches, no exterior pains, no swellings..