1) Will donor scar bump go down further.
2) Will reddish color of scar fade.
4) Will donor area feel natural when i run a comb through it.
From my recollection on another post, your surgery was only a few weeks ago. A lot of scar healing issues have to do with how wide the scar is, how well the edges were opposed, the tension the scar is under, as well as characteristics unique to you -- do you form keloids, etc. Infection and trauma can also make for poor healing or wide scars.
However, there is also a considerable component of time involved as well. Scars take months to mature; for weeks and weeks after the initial injury, there is swelling and redness from increased blood flow/vessels. Especially for the first few months, while the underlying tissues are healing and generating tensile strength, this is a very dynamic process. If you didn't have a problem with infection, etc., and you are not prone to poor healing or keloids, etc., then "redness" and "bumps" per se hopefully won't be a problem (although poor surgeon technique can influence the end texture). Over time, the redness will fade -- in fact in the end the scar will be less pigmented than the surrounding skin. The edema (swelling) should also subside -- again this takes weeks and months, not days, and you shouldn't freak out yet about its final appearance.
On the other hand, scars can be wide, and stretch, and hair does not grow in them. This is probably going to be, long-term, the bigger issue in terms of visibilty.
3) Will all original hair that fell out from shock grow back.
It depends. Check out NHI's website for an intro to shock loss: www.newhair.com/next/faq.asp