Here was the crash report requested by Kumasasa. Thanks again, sorry for delay.
Recommendations were found here:
http://help.mojang.com/customer/portal/articles/928783-minecraft-has-run-out-of-memory
Next post from me will be my attached crash report.
Thanks all, neither left nor right mouse button would place blocks/open doors. Only left mouse button would attack/destroy.
"Use Item" was set to "2", instead of "Button 2". Looks like I overlooked that simple investigation. Don't know how/why that button management was changed. Any ideas? Looks like this case is closed, thank you. One more comment, should I use the .bat file or no??? Thanks again.