I too had a heart attack at the end of September, whilst about 16 miles out from home, I thought that I had bonked or become a bit hypothermic (it was a cold day) & just felt rough with no energy, I only really started to worry when I started to get an ache in my armpits, like a typical head in the sand bloke I continued the loop home, doing 32 miles.
I had the angiogram done, but no stent fitted as the surgeon felt that the blockage was in a strange position & the risk outweighed the benefit, but he did open up the blockage & it's controlled by medication, so as others have said, it's a new beginning, you will get back on your bike, you will still do the climbs, in my case slowly as the beta blocker doesn't allow your heart rate to go too high, but by doing the cardio rehab, then gym work/spin classes & turbo sessions when the weathers too bad, you will be back, better than before, for example I took my bike to Brittany this year, I went out one sunday & a local club run pulled out of a junction about half a mile ahead, the roads were very hilly & without realising it I (captain slow) was catching them, I managed to make it known in broken French I was there & got an invite to join them for a few miles, but I could keep up with them.
I seem to be on the same meds, bisoporol, clopidogrel, asprin & ramipril, as others are, you may find that your extremities feel the cold, and the ramipril makes your nose run, but other than that the most important thing is we are all still here to tell the tale.
So get the cardiac rehab done, then take it slowly on the bike at first & gradually increase the distance, good luck with your recovery.