Hello clavio and welcome to DiscussFitness.
I don't know your
heart rate parameters, but 160 bpm is not anything to be concerned with for most people. I think you may not have totally recovered from your illness, given that you were performing this workout prior to getting sick.
My suggestion is that you start an
Online Journal and join our great community. Start posting your workouts with good detail. Others here will get to know you better and you will get to know us too. You'll get great feedback and support, and some good training ideas.
I believe your goals are realistic so the real question is: how bad do you want it?
We will help you in any way we can.
p.s. I'd stick with the stairs or someting equivalent. Pedal to the metal training is how you will accomplish your goal.