My first thought is that maybe you are trying to run too fast now and therefore struggling to get going....
if this isn't true then i would go and get checked out by the doctor just to make sure..might be something like asthma or even a heart problem............probably not but best to be safe
When you say it's getting increasingly difficult to exercise the more you go, is that just for running or for other exercise also?
My first instinct is the same as Seren's - are you pushing yourself more than you were previously? It's easily done without necessarily realising that you're doing it. Are you wearing a heart rate monitor? It may be worth trying to moderate your pace to a predetermined heart rate and seeing how long you can manage. It's difficult to objectively determine pace without some sort of feedback.
I'm wondering whether you're overdoing the dieting while trying to lose weight; are you sure you're eating enough to have the energy to train?
And I agree that you should probably go to the doctor anyway; even if nothing's wrong with your health, it's always recommended that you consult a GP before starting a weight-loss/exercise programme, so if you didn't go when you started, better late than never.
Definately get checked out and explain what is happening asap regardless of advice on here - you've obviously noticed severe degradation in your fitness and are worried, act on it. If you check out ok - no harm done.
My first thought was that you aren't eating enough for the increased exercise levels, but I agree with the others that you need to see your gp
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