Pain on my half head. Please

Hello I have hypothyroidism issues ...eating 112mg and my problem is that whenever I take stress or I have gastric or periods or when I am too much hungry my head pains and sometimes full and sometimes half...and whenever it happens my left side of glands near ear or back side of neck or my head swells up. But it heals automatically.Its happening since 2013. As now i have been detected with sciatica I am going to physiotherapy and chiropractic clinic. So it's been 5 days that when I returned from the clinic on that particular day night I started to have pain on my back of head exactly the left side... But sometimes pain like that and sometimes heals and then again I felt due to gastric it again pains and my left side is little swelled up... I don't know what's happening. Please 🙏 help.