Welcome wyo, Sorry you aren't feeling well. The neck pain has been a constant herx symptom of mine. The nausea and dizzyness can be a side effect of mino. You might want to contact your doctor and let them know that you are having those symptoms if they don't go away soon. http://www.drugs.com/minocycline.html
If you are having stomach problems, taking your mino with food can help. Also drink plenty of water. Are you taking probiotics? Very important. Ginger capsules with meals or OTC zantac can help with nausea. The dizzyness and nausea may go away after your body gets used to the medication. Standing up slowly may help a little with the dizzyness.
You may want to consider some supplements to help with detox if herxing gets too severe. There are lots of discussions about that here.
I'm not a doctor. These are suggestions based on my own experience and knowledge. Hope you feel better quickly.