J.,
My oldest was 9 when I found out I was expecting (that was after years of trying and doctors telling me it couldn't happen again). My baby girl was born when my oldest was 10... they seem to get along ok, but there is to big of a gap in age, but things happen. When my baby girl was just 6 mo old I found out I was especting again - turned out to be my little man. My baby girl and little man are only 15 mo apart. Yours will be a few months closer in age, but in time it gets a lot easier. The two little ones seem to learn a lot from eachother, they play together and keep eachother company when things around the house need done. We give them baths together, they seem to have fun splashing and trying to wash eachother. When they are apart (one at grandma/grandpa's) they ask for eachother... they are best friends. I won't lie, it took a little time to get use to there being 2 babies in the house... but to be honest it took time to get use to there being a baby in the house when my baby girl was born. All changes take time to get use to... but another baby is just something else to show the love you have for your hubby and to pass your love on to.
In June I will be bringing home my 4th bundle of joy... when I bring it (don't know sex yet) home I will have a 13 yr old (who we don't ask to take care of the little ones), a 3 year old and hopefully my little man will be 2 (his birthday is 5 days before my due date... I'm preying that I'm not in the hospital on his birthday). I won't lie and say I'm not scard... cause I am. But I love my hubby and my kids, which I love the one I'm carring too. I cried when I heard it's heart beat, when I saw the first glimps of it on an ultrasound and felt it's first movement. All loving parents no matter how much they plan for or try for a child are scard - and that fear can be shown in many ways including lashing out at the ones you love and can cause issues with the carring and delivering of the baby.
This one has been my hardest... I had my galbladder removed last year, and they were complications during that whole deal. I think some of my current issues are because of that. I'm just trying to do things a little slower and not getting upset if I don't get everything done right away... I worry about the importand things and if need be wait till tomorrow or the weekend to work on the other stuff. My hubby has been very helpful also... he carries the little ones up to bed since I can't, moved the washer and dryer from the basement to the 1st floor bathroom so I don't have to do the stairs as much and many other things. Lean on your man for a little while - I know it can be hard to do, but you two are partners... ask him and let him help.
I don't now much about the RLS and if anything can be taken for that without hurting the baby... your doc should be able to answer a few questions about all that.
Please take care, enjoy your little ones and I hope you can find the joy of expecting again.
J.