Am I right in thinking the addition of some speed work is fairly new. If so, the aches and pains might be related to that. I certainly suffer when I go back to some proper speed sessions. Then my body adjusts and I feel much better. Currently trying to hang on the back of my step-sons group at Trafford AC. Some of them are 15 min 5k runners.............I'm ruined. Buts it's the only way I'm going to get quicker.
The marathon was hard, hardest one I have done. It was the Salomon Trail Wales, trail marathon around Coed Y Brenin. To say it was hilly is an understatement. It took me 4:00 hrs (I did Manchester in 2:56).
The 'ironman' was called Outlaw. Not an ironman branded event, but the same distances for a fraction of the price. Not particularly bike or swim fit this year, but managed to get round with splits of.......2.4 mile swim - 1:09, 112 mile bike - 6:06, 26.2 mile run - 3:52. With transition time included finished in 11:18:21. Nowhere near my best, but the best I could manage on the day.
Next event is Challenge Weymouth (another 'ironman') on 13th Sept. This time with a sea swim.
Not doing Manchester marathon next time. Going to target London for a change (and not do Manchester the week before) and set a big PB hopefully.......high 2:40s would be realistic.
You seem to be making good progress and Louise is adding in additional sessions that will speed you up. Unfortunately, the only way to get quicker on race day is to run quicker in training.