I so know what you are going through. My husband/Master is away about half the time, every month, sometimes more. It wasn't always like that (only in the past two years), in fact for the first 4 - 4.5 years of our relationship we were practically joined at the hip - some not so kind people nicked us Siamese twins, lol. When He took this new job/client, it caused some tension between us - I wasn't happy about Him being away, and I don't exactly approve of the client. The separation anxiety - I thought I was going to die the first few times, two weeks seemed like such a long time. When it comes to Him, I am terribly clingy and needy.
It doesn't get easier, but you do learn to tolerate it.
Two things help me cope: 1) I throw myself into work, our son, I see my friends, I catch up on things I tend to low prioritize when He is here, I do things to make myself more pleasing to Him when He gets back (which can include anything between shopping for lingerie, visiting the spa or learning a new language or skill).
And we do talk every day on the phone, several times.
and 2) Its important to Him. He is a man who values pride and honor very highly. He takes great pride in His business and what He has made of it. I voice my opinions to Him - but in the end I always support His decision. (Just like He does when it comes to my career.) If I asked Him, dead serious, to drop it on my account - He would. But it would kill Him inside and I could not live with that. More than anything I want Him to be happy and content - for that, as far as I am concerned, price is no object.
You are not alone, hang in there.
xxx
Adriana