Bear with me, this is not the typical hounddog snark. We are all looking for a bug to explain symptoms that we are told come from...a bug. However, these symptoms also come from about 60 or 70 other sources (Most of them allergies of one form or another). My take on what you are describing is that you are getting seasonal allergic reactions to something. Oh by the way, allergies can lead to slight fevers through secondary issues, such as a sinus infection.

Please don't take this as a hit. It is me simply offering an alternative explanation. As an allergy sufferer for most of my life, you described exactly how they hit me as the seasons come and go.