It sounds as if you have two separate and unrelated medical problems. A pain in the buttock is almost always caused by compression of the sciatic nerve. In that case a steroid will help, but only for a short time. These medications are inappropriate for long-term pain relief. You need an MRI of the lumbar vertebra L1-L-5, and after that, decide upon the right treatment.
Go back to your doctor so that you can be referred for physiotherapy.
Sciatic nerve problems will settle down, but you do need to be given advice on what to do or not do.
If the pain is severe, then rest and apply cold or heat. Some people find heat helps and others find a cold compress helps. Try the heat first, by applying a wrapped up hot water bottle, or you can purchase charcoal pads that stick to your back or wheat bags or gel packs that can be put into the freezer or heated up in the microwave.
You may find that gentle message may help to relax the muscles that are going into spasm. The doctor can also prescribe a muscle relaxant as well as the steroid injection.
For your severe sinus infection, the doctor will be able to prescribe an antibiotic for this if he feels it is caused by bacteria. For a virus infection the doctor will not prescribe an antibiotic as these have no effect against viruses. For help at home, have steam inhalations 4 times a day for a duration of 10 minutes (if you can). This is what my doctor advised me to do.
This is what you do to have a steam inhalation.
In a large bowl pour in a kettleful of boiling water (taking care not to get scalded). Put in some Vick or Olbas oil or any menthol oil (steam on its own will also help). Bend your head over the bowl and cover your head and the bowl with a large towel. Inhale the steam through your nose and breathe out through your mouth. Doing this will help to loosen up the congestion and allow it to drain or be coughed up and spat out.
You can also buy menthol lozenges to help decongest the sinuses
The nausea you are experiencing may be from the sciatic problem, but it may also be from the infection. Bacterial and viral infections can affect the stomach and may you feel nauseas sometimes.
To help reduce any fever (which you may have if you have a sinus infection) and also help to reduce the pain, you can also take pain relief medications, like paracetamol. Your doctor will advise you. Ibuprofen which an anti-inflammatory is fine for some people, but needs to be taken with or after food as it can upset the stomach and some people do have an allergic reaction to it. Your doctor will be able to advise you and/or prescribe the meds for you.
There are also anti-inflammatory gels that can be purchased or prescribed that you lightly message into the area of pain if you are not able to tolerate the oral medications for relief.
Stay away from shots and drugs. Go to a Chiropractor who has Decompression and see if you are a candidate after he or she examines you. If you are the results you will get with Decompression are better than anything else I could recommend.
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