How much should I run?

I think your previous workout was a little too much for you. I think you need to start working yourself up to doing that workout on a regular basis. Start by walking the first lap, running the next 5, and walking the last lap. Every 2 days, add a lap. Continue to ride your bike and ump on your trampoline. Maybe once a week, instead of running you could jump rope or go for a swim. Both of those are great work outs and it gives you a break from running. Good luck! I know you can loose the weight! Don't forget to stretch ;)

You should really be careful not to over-train yourself.

Basically, if you really want to lose those 7 pounds you must keep in mind F.I.T.T. (Frequency, Intensity, Type and Time) - hence training more, trying harder sessions, changing exercise and exercising more.

Plan out your week properly. In the coming weeks try a harder running session, go jogging for longer than a mile, keep pushing yourself till you just have to give in. The following day have a relaxed session, on a bike for about an hour, then for the rest of the week continue how you usually do. Just keep pushing yourself, but make sure that when you're getting too tired or feeling too sick, to stop and rest immediately. Drink lots of water and eat the right food, make sure you take enough carbs!

Hope this helps.