I may have had something similar. this year I've been training for a marathon and 2 days after my first 20 miler, I came down with a cold. took it easy for a few days, then built up again and a fortnight later diid a second 20, and got the same cold again.
I took a full 8 days off, to make sure that I'd really cleared the cold out, and have been clear (touch wood) ever since. Maybe you've taken too much out, and you're just continually relapsing? Take some time out, recover properly and then try getting out.
I find this weather is deceiving, you think you are warm when running but after 15miles you can slow down. This inevitably means that you are cooling down while being outside in small amounts of clothing.
I later discovered of course that the reason for my slowing down was due to not onboarding enough pre-run and during (electrolytes are a special thing!).
Though it does sound like you are experiencing high levels of fatigue. How have your 15-20milers been going? Have you been left feeling rough and no good to anyone?
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