rainand my heart goes out to you, I was in exactly your position. I felt like death barely warmed up from week 6 to week 11. I posted on here about it and people were lovely and said it would almost certainly pass and I didn't really believe them!! :) I honestly felt so bad (nauseous constantly and tired like I couldn't have believed; drugged was a more accurate description). It reached a low point in middle of week 11 when I started crying, alone, in public. Just couldn't face feeling so unlike myself anymore. Then at the end of week 11 I quite suddenly began to feel a little bit better... by middle of week 12 I was VERY much better... and suddenly at about week 13 I stopped thinking about it because I felt fine.
Am now 16w and feeling like my old self, food aversions have almost entirely gone, appetite is back, never nauseous, no more than ordinarily tired.
I am SURE the same will happen for you, even though I didn't believe the lovely MNers who told me the same!!!
Just try to get your head down and get through the next few weeks, cancel everything you can possibly cancel on the social front, sleep whenever you possibly can and eat what you can manage. And be easy on yourself!! I hadn't at all appreciated just how much was going on inside at that stage - an entire person is being formed very very fast indeed - so it's honestly no wonder you feel (like I did) like you've been hit by a bus.
Good luck and keep going :) xx