I get this a lot-and most always when it rains. I stay chronically stuffed up and I have tried saline sprays, steroid sprays and so on to no avail. All of the prescription sprays I nused made it worse. My doctor said my turbinates are swelled in my nasal passages and that can lead to a lot of the same symptoms you have. I am not saying that is the cause of your symptoms but you may want to talk to your doctor more about it.

Usually after the rain it washes away blossums etc which helps us feel better

Do your symptoms start before or after it starts to rain? I got to the point that I could feel the rain in Arkansas and I live in Middle Tennessee. I would develop worsening headaches, irritability, leg pains, extreme fatigue with these fronts. My husband's allergies and headaches kick into overdrive as well and now our 4 year old is displaying some of these symptoms. When researching headache and numbness/tingling remedies (I was having headaches every day and numbness/tingling in face, upper back, etc.), I came across vitamin deficiencies. I started out taking Vitamin D, calcium, and high-quality magnesium. The headaches and numbness/tingling pretty well stopped. Then I started adding other vitamins and minerals - B complex, A, E, zinc, potassium, and others. Now the symptoms with weather fronts have dramatically lessened. My husband can't take vitamins; he says they make him sick. My blood work had shown that I was not deficient in anything, but I do remember that my Vitamin D was a little on the low side. I saw that low Vitamin D was treated with 50,000 units once a week, so I wasn't concerned about taking a 5,000 unit dose. A lot of people believe that the RDA for vitamins and minerals are way too low. I know there are supplements for antinflammation. Pseudoephedrine also helps a lot with the headaches, although it's a pain to purchase, thanks to meth makers! After my experience, I don't doubt that.
I have also researched weather sensitivity. There's not a lot of information on the topic, but I have found that some people believe that weather fronts wipe out negative ions that we need to feel well (negative=good). I don't have much experience with negative ions, but everything I read makes since.
I feel for you and really hope any of this information helps. There is no way of avoiding the weather and it can make you miserable, but there is hope.

Oops, I didn't edit too well! "After my experience, I don't doubt that" should go after the Part about the RDA being too low. Sorry!

My symptoms are at their worst before it rains and lessen but don't go away completely while it's raining. I take some Vitamin D but can't take too much because I think I have hyperparathyroidism again which causes vitamin D deficiency. It also causes high calcium and high parathyroid levels. I've had both parathyroids on the left removed. I do try to take a multivitamin and vitamin C. I'm glad that the vitamins have helped you.

When it rains I my get head pressure that feels like my head will explode, same with sinus pressure above the eyes, ear pressure, drainage causing nausea. I recently purchased a MyPurMist steamer from Target. It has a face mask and steams your nose and mouth. I started using it 2 - 3 times a day. I will have to wait and see if that is what is helping or if I'm just having good days. Time will tell.

Good Luck.

I hope the steamer helps with your sinus pressure and drainage. I can't use steam because it triggers my asthma. It's raining here today and my sinus pressure is building.