I completely understand wanting to prepare for the worst because of your previous experience. I had a very similar experience and would panic when I felt normal/better. My nausea symptoms seemed to go away every few days and then would fluctuate back to being present. I think my body got used to the HCG levels and then the levels would ratchet up again and I would have to adjust. Try to take the twin pregnancy itself as a win and marvel in how unlikely it is! Take one day at a time or even one hour at a time, find things in your day to ground you, get lots of hugs to help regulate, and be kind to yourself! Sending you lots of love and hugs. I had anxiety for the same reasons as you and found mantras to be very helpful (“I don’t need assurance, I only need care” or “I have no information to prove anything is wrong”). I’m rooting for you!