It's one thing to check Google for sites such as Mayo Clinic and NIH when you have a diagnosis and don't feel your doctors are doing the appropriate things. It's a good way to double check things. But googling symptoms blindly is never a good thing -- symptoms are similar for many many things you don't have. One thing I wonder is whether you actually researched how severe an illness mono is and whether your doctor talked this over with you. It's not a cold -- this is a serious illness that takes a while to calm down and then you have to take care of the future problems it can raise, such as with your liver. It's also been diagnosed, so you know what you have -- it's a common illness, so your docs would surely know it from lymphoma. Stay off the Google looking for random symptoms but do research what you do have so you can handle it properly.
You have no medical background and Google is not a course so as long as you insist on checking in with Google you will never stop being anxious. Google can find a disease for anyone's self-diagnosed symptoms so it is never a pleasant experience Googling symptoms.