Normal processing time for Forms 1040X is 8 to 12 weeks from the IRS receipt date.
Generally, to claim a refund, Form 1040X must be filed within 3 years from the date of your original return or within 2 years from the date you paid the tax, whichever is later. Returns filed before the due date (without regard to extensions) are considered filed on the due date.
Based on your information - you should receive your refund soon.
You may verify the status of your refund by calling the IRS helpline 1-800-829-1040.
Be prepared to provide some information from your tax return for verification purposes.
Let me know if you need any help.
You may just walk-in to the local IRS office and talk with the representative.
Please find here - http://www.irs.gov/localcontacts/index.html
Please verify if the IRS received your amended return.
Do not send another one unless you verify that.