Caoils - I was an Account Director/Manager at a big American communications company when I "fell" pregnant (a bit of a surprise) with DD. I had been there for 10 years and was widely recognised as being major contributor blah, blah, blah - you know how it is!!
So, my account (had one major financial institution in UK; biggest target; etc) had to be looked after by some young whipper snapper while I was off. Like you, I dreaded this... The good news, though, was that they really missed me and were overjoyed when I came back to work (and I'm not that good).
I know it's dog eat dog in Sales but if you're good and I bet you are, then I think you'll be surprised at how much you will be missed and also how much clients will put up with from someone covering the account temporarily.
Women are always better at relationship management and sales than men are. We have to work harder in the first place and I women in business always just get on with it and don't have all that ego crap getting in the way IMO.
I did find it hard when I got back as I had been so career focussed previously. I made a very difficult decision when I was head hunted by a very large UK communications company (it's good to talk, and all that) and actually ended up moving from my old job within six months of being back at work (only had four months off - single parentm needed the money). This, in hindsight, was a mistake. I think you need to give yourself time to get back into the rhythmn of things before you make any major decisions on your return to work.
What area of business are you in? Just being nosey!