My husband was "diagnosed" with Lyme Disease Monday, July 1st. He didn't see the tick either, but had the "Bulls-Eye" and a bruise around 1 tick bite in particular (he had about 10 or so total). I put diagnosed in quotations, because the Dr. at the ER said he is showing all the signs, but, until the blood test(s) come back for confirmation, an absolute diagnoses isn't something he could give.
He was given medication that, I think, he has to take for 3 weeks, he also has to go in for evaluation or tests or something at some point as well. He's also mentioned something about possibly having to go to UVA (as we are located in Virginia) for another 6 months after (once a month or something, at this point, I know very little as to treatment(s)).
From what I've read, and what he's told me of how he feels (as well as other's he has talked to who have had it), Lyme Disease is very much like Rheumatoid Arthritis. It causes a lot of inflammation and, according to what I've read, can also have psychological effects as well. He has a lot of headaches, weakness, and pain!
From what you've posted, it sounds very much like Lyme Disease! Has the Dr. sent blood for testing? Is it a definite diagnoses or a diagnoses like my husband is currently under, at present? Has the Dr. given you any kind of information about Lyme Disease (My husband came home with a print out of the stages and other information about it)?
My advice would be to get an absolute diagnoses and follow treatment completely! Lyme Disease will, if left untreated, continue, worsen, and cause inflammation and issues throughout one's entire body, inflammation of or around the heart (muscle) is one that has stayed in my mind. According to someone his family knows, the disease had nearly killed someone the person knows.
If the Dr. you are working with isn't very familiar with treating Lyme Disease, discuss with him/her options and Dr.'s who are!! My husband knows a number of people (he's military) who have had it (our dog has even had it!), and I'm only aware of one person who may be having complications because of it due to not following through with the entire treatment process (whether unknowingly or not, I'm not sure).
I don't want to sound all alarmist or anything (despite the fact that I'm kinda freaking out myself), as it seems like it is treatable and, hopefully, not a life long concern, but that's if it is treated correctly.
Please don't hesitate to reply if you want/need!