I'm a 35 year old male. For the last month, I've had this odd, ill defined "sickness" that won't go away. At first, my chest felt heavy and tight, I could not breath freely, and then I noticed that my sinuses may be slightly inflamed due to the fact that I have a crusty nose and slight sinus symptoms such as mild frontal headache and cheek ache, and waking up with a slightly sore throat. However there is little need to use tissue for my nose, and I'm not sneezing or coughing and I'm not really stuffed up at all.
But these symptoms persist after a month: a very slight sinus issue, light headed spells, slightly enlarged lymph nodes, slight headache in the front, and a tight chest and not being able to breath in right. I also have slight need to clear my throat when I wake up in the morning. I also feel somewhat run down like I am about to get full blown sick but nothing ever comes on and develops.
I did see my doctor 3 weeks ago, who examined me and did the usual basic tests but nothing showed up.
It may be worth mentioning that I have within the past few years had an ill-defined tooth/jaw pain issue related to a previous filling in my molar, which flares up occasionally and responds somewhat to amoxicillin (it is not an abscess, perhaps it's related to food getting trapped above my filling, or something else related to my filling). In past episodes, I had slight fever and swollen neck lymph nodes and severe jaw pain, from these flare ups.
I work from home, so I've not had any particular environment changes or anything like that. The one and only thing I've been exposed to differently is that I got a new cat back in April, 6 months ago, and I've never lived with a cat before now. But remember my "illness" only started a month ago.