Greasy hair problems

So we will start here I used to dye my hair a lot probably every 4-6 months. Then I got pregnant and went on a streak of not dying my hair for 1year. I've tried what seems like everything to make my hair healthy again, I've shaved it a lot as I love having short hair, I've used head and shoulders (I'm allergic) and I've even gone on parts of the week taking a shower but not washing my hair. I wash my hair on Monday's and Thursday's. Is there anything I can do to make my hair look and feel better my wedding is soon (5-24-18)

I inserted a picture of myself for reference as to what my hair looks like