The solid white skins could very well be a tapeworm. I treated my Tapeworm with doses of praziquantel. It did a good job for me and killed the tapeworm. It has very little side effects. So, I think you are o.k. there. The rolled up skins that you mention, a trapezoidal shape that is rolled up on itself would have to be a fasciola parasite of some type.
It's possible you could have contracted it thru raw fish, if you have tried that sort of thing. I have this infection and couldn't really tell I had it until they burrowed out of my liver. I didn't feel any strange sensations in my gallbladder until about 8 months after I got it.
Regardless, I wouldn't spend the money on going to a doctor getting this tested. I did numerous times and it was pointless. I would go ahead and try to get the triclabendazole and treat it with 10 mg/kg and do the dose atleast 3 times. If it were me I would space them out every 12 hours. But, I would do atleast three, maybe even more. I got the egaten/triclabendazole from Dr. Chieu. I think you are doing o.k. Praziquantel and triclabendazole in my opinion are the ones that have the least side effects. The flukes can become resistant to the egaten and therein lies the problem. They developed a resistance to the egaten with me and I have kind of been drifting in terms of how to treat them.