Invisalign for lower front teeth - now have chewing, swallowing & sinus issues

I decided to use Invisalign for some minor changes in my lower front teeth. I spent an hour with the dentist asking many questions. She never told me about dark triangles, alterations in my bite, difficulty swallowing, damage to m expensive onlays and exacerbations with my sinus issue. It has been eight months and it is getting worse. I am so unhappy that after I see her this week I plan to go to another dentist for a consultation. I cannot chew and swallowing is very difficult and getting worse. So far I have lost 15 pounds and I was on the thin side to begin this treatment. I would appreciate any comments particularly about the chewing, swallowing and sinus issues I've experienced. My teeth no longer touch in the back and I have several teeth in the front with nerve pain every time I change aligners. In my experience this is not a simple solution to misaligned teeth. I would never recommend Invisalign.