i will be landing at Heathrow airport on my journey from India to USA, will I be asked few questions by immigration or do they have time to dig into my ancient immigration history when I was a student in UK many years back. I am an Indian holding a USA visa and been to USA 2 times before sleeping overnight at Heathrow, was frightened to approach passport control when I was there last time.
If (a) your flights are booked as one booking, (b) you're not transiting overnight, and (c) your luggage is checked through to the USA, then you shouldn't have to go through UK immigration at all, so it's very unlikely you'll even see a UK immigration officer.
Your airline will check that you're eligible to transit through the UK (a US visa means you should be good to go), but they won't ask any questions about your immigration history.
Given your UK immigration history, yes, you might be questioned. It is difficult to fully understand your history (you were denied entry in 2009 and later received a 10 year ban in 2012 for some unspecified reason which was then supposedly overturned in 2018), but it's clear that it is complex and may require more scrutiny than can be sorted out quickly at the primary inspection booth, so you could be questioned while that is sorted out. That's particularly concerning because you apparently have a history of falsely confessing to immigration violations when questioned.
But you say that you were "frightened to approach passport control when I was there last time." It's unclear when that happened. If you've recently made the same trip through Heathrow without incident and nothing else has changed, it stands to reason that you're likely, but not certain, to receive the same treatment again this time.