A Heavy Lid(outdoor Swimming Pool Chest) Fell On My Head

A heavy lid(outdoor swimming pool chest) fell on my head on Monday. I felt a bump appear in that area. After a few minutes I felt a little dizzy, nauseous, fuzzy vision, tired and got a headache. Later in the afternoon I had some pain in my lower back on each side. I saw my doctor at 7:30 am the next day, Tuesday (the earliest I could get an appt). She said that with some rest and no technology use like tv, texting, computer, no driving or any activities for a few days. She gave me some muscle relaxers. I only took them once. On Wednesday morning my neck felt tense and a little stiff. Got a slight headache again and still with slight back pain. On Thursday I got a little dizzy again so I rested more. Today Friday I woke up dizzy, I had to blink a few times to clear up my vision, felt nauseous, have a headache, feel extremely tired and now have diarrhea. My husband and I are supposed to fly out tomorrow for a vacation. I’m concerned. Should I go to the emergency room and get a cat scan?