Immunity

My Thanksgiving has gone well, but it's been marred by a slight chest cold. I'm mostly feeling fine, but I wheeze and cough occasionally. My parents are here until Tuesday and we would have gone out and done fun stuff, like go to Astoria, but they won't let me leave the house when I'm sick. (As well it should be). I'm starting to feel as though maybe my mom's right, and the damp Pacific Northwest isn't good for a person with a low immune system like I have (I'll get the consumption like they did in Limerick). Which means that if I want to be healthy, I have to go live in a hot place that would make my husband be constantly sweaty. A place with no public transportation, lack of water, and suburban sprawl. I hate that notion and want to just stop being sick. Doctors say that there's no way to really improve immunity, aside from drinking horrible citrus drinks when you're not sick and exercising. I'm starting to drink the citrus, even though it kills me. But I know it won't be enough. I feel like if doctors are so hampered with the truth and facts that I can't stay well because they say there's no way for me to stay well, then I should consider following some pseudo-science. At least it would be a better placebo than "there's nothing you can do."
I hereby open the floor to suggestions on improving immunity.