At some point, do you think the symptoms from mono are exacerbated by unconscious psychological things? I'm not saying that mono or its symptoms are fake. Indeed, I've been suffering from them for more than two months. I've just come to wonder recently if the feelings are made worse by our thoughts and attitudes. For example, I expect to not get enough sleep, to not have enough energy, to not be able to exercise. Could those expectations in fact make me experience those things?
Look at it this way, any illness that can last for months and months is bound to have psychological effects. I wouldn't say that your "thoughts and attitudes" would make your mono symptoms worse, but the worse your MONO is, the worse your thoughts and attitudes will be. Hope that helps!