Training going like a dream then I hit a low mood 5 days ago

grumpygit1962

Had this on another board, but think it might have been the wrong place.

Here is a bit of an odd thing I am going through mentally. I have had a few ups and downs over the past few years, biggest being my ill mother who passed away last year after a long battle with MS.
My fitness has never been so neglected like it has been over the last few years, though I did train on the odd occassion and to be fair what I put myself though in negative ways did not damage me as much as it could have done.

I am back in training this year with a slight difference. I have always jogged and was once very good at it though I have always hated it. I have recently really falling in love with cycling, so much so that the many hours and miles I put into is hardly noticeable in suffering as I love it so much, I am talking some 80 mile bike rides already with a body and mind that was a bit damaged.

We all know about endorphines, and everytime when times were tough and I went out for that jog when times were tough I got the same buzz and like so many of us thought to myself why do I not keep this up.
Cycling has been no different with that endorphine kick, well it was until last Saturday. I came in from a 45 mile bike ride after doing a few more bike rides that week, like I said I did not find it a hardship. Then after the ride I felt unusually low in mood which went on for a few days. I was due to cycle on Monday or Tuesday even with legs a little tired and thought I had better give it a miss because of the way I have been feeling. It is now Thursday and this is now the longest I have gone without a bike ride in months(5 days), and it is not down to motivation or being lazy. I still feel very low in mood and have felt run down and a few aches.

Could I have been over training?, even though I have loved every bike ride to a point, last two rid