How can I rekindle my wife's feelings for me?

I work a lot out of town at a job that supports us well but I hate and own a business in town that is struggling financially but recovering slowly. When I arrive home she has been managing the household and our 3 great kids as well as working. I can't afford to quit my job as she is already stressed about money and the bills we have created. We have been married 18 years and I am still desperately in love with my wife and crave to spend time with her when I arrive home. However a peck is usually the most I get after weeks away so I tend to feel awkward about how to approach such a lukewarm reception. This causes me to be in a poor mood and she complains it's not her job to entertain me. I have tried being positive and not letting it bug me but while it fulfills her apparent needs it does not solve the problem of me feeling unwanted and undesired in my own house. is rare and always only a that I'm sure she performs as a wifely duty. She is a good person and there was a time she wanted me as saw me as a refuge not a burden. Just to let you know I have showered her with romantic gifts, trips and affection throughout our marriage so it's tough to make a new impression (I promise I am not exaggerating) and now she says she doesn't like surprises or trips she doesn't know about. Ladies please give me your perspective. I desperately love this woman but I am losing her and my desperation is showing which is bound to harm the situation rather than help it. Suggestions?