Jennie, I've been married for a long time.
Like you, I crave and need solitude and suffer when I miss it for very long. I need time to think, read, write and process. My husband is not clingy or needy and gives me space, though we do a lot of things together. Does your husband understand when you need to be alone, specifically, and when you are ready to interact again? Maybe if you could be specific with him, he would be able to be patient. For example, we are always in the habit of long walks together in the evening and in the afternoon, if he is home at that time. It's kind of an understanding that we will chat and share at those times for sure. We have fairly regular meal times and there is always interaction at those times, too.