Dr- It does sound like you do have signs of poltergiest activity.
Some poltergiests are brought on when people are going through puberty, changes in the hormones, stress, etc can be at the root in such cases.
Some are brought on in adult life during periods of stress. Finding out what's causing the stress and resolving it can sometimes help things to settle down again.
Some, though they are usually a secondary feature, or actually created by spirits that reside in the house. They may not be happy with some of the changes you've made, or just want to be acknowledged, or may have other reasons to acting up.
Normally, poltergiests don't last long (luckily), though there are some that do go on for quite some time. If you feel it will help, have your priest do a blessing, try any cleansing rituals you know of, and if need by I'm sure there's a paranormal investigative group in your area you can contact- they're usually pretty discrete, quiet, and won't release information without your permission.
Hopefully you'll be able to get things to calm down again.