When you reach orbit, you have successfully reached a speed where you are constantly falling "around" earth rather than towards earth. That is the trick to orbit. In space there is nothing to create enough friction to slow an object down to start falling towards earth. So if you gain momentum away from earth or the ISIS, there isn't enough friction to reduce your speed to start seeing the effects of gravity. TLDR - you would need to slow down considerably to start falling back towards earth. There is nothing in space to slow you down fast enough.
So you and the ISIS are traveling around the earth? Then I guess you’d be worried about the ISIS floating away from you if you became detached and separated by some distance, Is that correct?
Correct, Reaching an orbit means reaching a speed where you are constantly “falling” however you are traveling so fast as you fall, you are falling out over the earth and that happens constantly. The higher up, the faster you have to go to keep the orbit stationary. Another way to look at it is to think about running and jumping off a bridge, as you leap you start to accelerate towards the water. That happens in a curve. You are still moving forward but start falling. An orbit is the same thing but you never hit the water, you go so fast you miss the earth entirely. And that continues to happen as you circle the earth. The idea of weightlessness isn’t bc you aren’t effected by gravity, it’s bc you are in a constant free fall.
It’s actually the opposite: the higher you are, the slower you go. For example, a low earth orbit satellite goes at ~500miles up goes about 15000mph. A geostationary satellite at 20,000 miles up only travels at 7000 miles up. Reason is you’re less effected by gravity so you aren’t falling as fast. Same thing applies to high elliptical orbits; the orbital speed is fastest at perigee (closest point) and slowest at apogee (farthest point)