Work - represents concerns or issues connected with your work....including a 'job' you need to do at home.
Dreaming that you are at work, indicates that you are experiencing some anxiety about a current project or task. The dream may also be telling you that you need to "get back to work". Perhaps you feel you have been slacking and need to pick up the pace. 

To dream that you are at your former workplace, or of former coworkers, suggests that there is an old lesson that you need to learn and apply to your current situation.

Alternatively, it may suggest anxieties about a current task or project. You may be procrastinating, and your subconscious is telling you to "get back to work".

Being ignored, or feeling invisible - may reflect your feeling of being ignored by people in your daily life. It could also suggest that you have a low feeling of self-worth, or low self esteem.
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Is there something that you have been putting off?
Is there a current situation that demands your attention, but you're unsure on how to go about solving it?
Is there something from a past experience that you could apply to a current situation?
Do you feel as though people don't listen to you when you speak, or they dismiss your ideas before they even 'listen' to them?

I hope I could give you something to go on, good luck!