Suggest Medication For Sickness In The Stomach

Hi. I have for a few months had some vague symptoms that I never put much thought into. A few times of nausea that went away after a few hours, some stomach aches that didn t last for long, and problems losing weight plus a bloated belly. I put the issues aside thinking they could be stress, the bloated belly could be my weight gain. For the last few months I ve been gaining weight instead of losing, despite being careful with what I eat and doing more exercise. I ve never had problems with losing weight before. Over these months I ve also had different stools, from diarrhea to normal. For about a week I had some stomach pain, like a vague stinging pain on the left side by the navel. I also had a lot of gas, so I thought it was because of this. A few days ago I found something in my stools, that looked like a large pumpkin seed covered in what looked like slime (I thought it almost looked like a small floating tea-bag in the toilet when I first saw it). I took it up, and it had what looked like a sack on one side, with water inside. This popped when I touched it. Afterwards it tried up, and it now looks like a large flat pumpkin seed, light brown in color. I haven t been eating seeds, so this made me a bit troubled. I tried to look online what this could be, the closest thing I could find a description of was dog tapeworm. I have no idea how I could have gotten that. I was bitten by a flea a few months ago, and got pretty ill afterwards with a swollen leg, nausea and sweating. But I ve read you can t get tapeworm just by a flea-bite (even though the symptoms with my stomach started a while after the bite). Any idea if this could indeed be tapeworm, or something else?