Well, one thing is for sure: You don't have lymphoma. You've been tested out the wazoo. Something would have been found, especially because if you've been "symptomatic" for that long, then there would have been plenty to pick up on. There wasn't, though. So you don't have lymphoma.
There are some other things for sure, too: You are pregnant. You have anxiety. All of the aforementioned things can cause tons of crazy symptoms and all sorts of bodily reactions. Not every little thing your body does is the end of the world; you are alive and thus your body does things. Not everything is a symptom. Not everything is a sign of something horrible or malicious. Once you stop focusing on these things, there presence will lessen.
So, where do you go from here? Towards getting better. Being happy. Being healthy. Doing it for your baby.
I would highly suggest seeking therapy if you haven't done so.