Malicious prosecution or abuse of process can be difficult causes of action to prove because it requires a showing of intent. If you proceed, you will need an attorney to help you with the arduous factual an legal research required associated with this potential case.
I suggest you smile, appreciate that your criminal charges were dropped, and let the whole thing go.
See my answer to your previous question.
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The answer to your question is unequivocally YES, you can sue them. The specific facts of the case will determine whether you should sue them; however, DO NOT post any more facts about your case on a public forum. If you want me to review your case, you can send details to my email address (firstname.lastname@example.org) or fill out a free case review form at www.sainjurylawyer.com.
If you can assemble competent evidence to support the factual matters asserted in your posting you might have a viable civil action against Walmart. This is really not a criminal defense question but instead a civil matter.
Sounds like you would have a sharply contested civil case with a difficult burden of proof resting on your shoulders which you might or might not be able to carry. There will be credility issues and every word you say will be disputed. I suggest you consult an attorney who has experience in civil rights litigation to have your case evaluated. It might be worth pursuing, but that is by no means certain.