Hi Awakening,
Those past houses represent you as well. If it was a past house you lived in, then it most likely means that house represents a memory of how you were feeling then, and you must be feeling that emotion or that memory now, or have felt it in the past 24-48 hours.
You can have a beautiful house dream one night and then a demolished house dream the next night (actually both in the same night) You have to figure out how you were feeling the day of (and take in consideration the past 24-48 hours) of the house dreams.
In order to read the dream I need specific details of what was going on in the house. (I know you don't remember so I suggest just let it go. Since it's recurring then it needs to be worked out. So next time you have these dreams, and if you have time try to remember details when waking and write down everything that you remembered)
Each symbol represents something your thinking or feeling, and then I take all the symbols and tie them together to make a theme of what may be going on with you.
I would guess, and this is a guess because I don't have any information that went on in the dream, is that you dreamed of those houses because what ever bad memory you had at that time you lived there, your currently feeling that way now. This is based on what you said about waking up feeling bad and with anxiety.
Even if you had mostly good experiences in those houses there may be ONE (or many) incidents that upset you, and your subconscious has not forgotten them and is bringing it up now, to help you figure out what is bothering you in order to solve a problem.
So when you actually woke up from those dreams there was a spider next to your bed? That is a little creepy but I wouldn't relate that to the dream unless you seen the spider before you fell asleep. Spiders that appear in dreams are not always bad. But most people fear them so they tend to be bad themes in dreams.
Spider's Wisdom Includes:
*Master weaver
*Weaver of the web of fate
*Wisdom
*Creativity
*Divine inspiration
*Shape shifting
*Understanding the patterns of illusion
*Female energy for the creative force of life