I have migraines worse in the spring than any other time. This year, my allergies seem way worse and so are my migraines. Any correlation?

Yes. Sinus allergies can cause fluid accumulation which can then cause headaches. Would recommend non drowsy anti histamine such as zyrtec or allegra (fexofenadine).
Hay fever migraine. Allergic reactions in the nose have been associated with aggravation of migraine headaches. Treatment of your hay fever with oral antihistamines (such as zyrtec or claritin) or nasal steroid sprays (such as fluticasone) may significantly improve the frequency and severity of our migraine headaches.