Hang in there Meggles!
Don't worry about the tablets. I have terrible morning (all day) sickness since 5 weeks, and still going at 25. And I have taken every different drug the GP would give me for it. Baby is just fine - nothing wrong on the 20 week scan. It is better for your baby for you to be safe and as calm as you can be.
I have been at the 'sobbing hysterically' point more times than I can count. The only think that helps me is a CBT strategy I have been working with called 'mindfulness'. It is about staying in the present moment. When you find you thoughts drifting (for me, all the time), say to yourself 'back to the present' and re-focus on what is around you - noises, images, anything. It takes a bit of practice, but it does take the edge of things. I have to keep dragging myself back from the panic, but you have to fight it.
You can do this. Everything is ok, and we are here for you.